.NET: Microsoft.Agents.AI is giving 404 Resource not found although the input values are correct.

[MSRY]

Language/Version
What package version of the SDK are you using.

• Language: C#
• Package version: 1.0.0-preview.251016.1
• SDK Use: Agents Hosting

If you're using the Agent Hosting system, please complete the following information:

• How are you Hosting this: Cloud
• Are you deploying: AppServices
• Are you using Azure Bot Services: Yes, Azure Bot
• What Client are you using: MSTeams
• What dotnet\node\python version is your build in: 8.0

Describe the bug
Although the endpoint URL, and deployment-id are correct, the SDK is reporting 404 Resource not found error. It is not considering wrong API key when we tried for debugging purpose.
This failure case has following packages installed in the project.
Project 'AssistantBot.Application' has the following package references
[net8.0]:
Top-level Package Requested Resolved

AdaptiveCards 3.1.0 3.1.0
AdaptiveCards.Templating 2.0.5 2.0.5
Asp.Versioning.Mvc.ApiExplorer 8.1.0 8.1.0
Asp.Versioning.OData.ApiExplorer 8.2.0 8.2.0
Azure.Identity 1.17.0 1.17.0
FunctionalDdd.Asp $(FunctionalDddVersion) 2.1.1
Microsoft.Agents.AI 1.0.0-preview.251016.1 1.0.0-preview.251016.1
Microsoft.Agents.AI.OpenAI 1.0.0-preview.251016.1 1.0.0-preview.251016.1
Microsoft.Agents.Authentication.Msal 1.1.151 1.1.151
Microsoft.Agents.Builder.Dialogs 1.1.151 1.1.151
Microsoft.Agents.Extensions.Teams 1.1.151 1.1.151
Microsoft.Agents.Hosting.AspNetCore 1.1.151 1.1.151
Microsoft.AspNetCore.OData 9.3.2 9.3.2
Microsoft.AspNetCore.OpenApi 8.0.13 8.0.13
Microsoft.Bot.Builder.Integration.AspNet.Core 4.23.0 4.23.0
Microsoft.Bot.Connector 4.23.0 4.23.0
Microsoft.Extensions.Http 9.0.1 9.0.1
Microsoft.Extensions.Logging 9.0.6 9.0.6
Microsoft.Identity.ServiceEssentials.AspNetCore 1.36.0 1.36.0
Microsoft.Identity.Web 3.9.4 3.9.4
Microsoft.SemanticKernel 1.61.0 1.61.0
Microsoft.SemanticKernel.Agents.AzureAI 1.61.0-preview 1.61.0-preview
Microsoft.SemanticKernel.Agents.Core 1.61.0 1.61.0
Microsoft.SemanticKernel.Connectors.AzureOpenAI 1.61.0 1.61.0
Microsoft.SemanticKernel.Connectors.OpenAI 1.66.0 1.66.0
Microsoft.TeamsFx 3.0.0 3.0.0
ModelContextProtocol 0.3.0-preview.3 0.3.0-preview.3
NeoSmart.AsyncLock 3.2.1 3.2.1

Transitive Package Resolved

Antlr4.Runtime.Standard 4.13.1
Asp.Versioning.Abstractions 8.1.0
Asp.Versioning.Http 8.1.0
Asp.Versioning.Mvc 8.1.0
Asp.Versioning.OData 8.2.0
Azure.AI.Agents.Persistent 1.0.0
Azure.AI.Inference 1.0.0-beta.4
Azure.AI.OpenAI 2.2.0-beta.5
Azure.AI.Projects 1.0.0-beta.9
Azure.Core 1.49.0
Azure.Security.KeyVault.Certificates 4.6.0
Azure.Security.KeyVault.Secrets 4.6.0
Azure.Storage.Blobs 12.23.0
Azure.Storage.Common 12.22.0
FluentValidation 11.10.0
FunctionalDdd.DomainDrivenDesign 2.1.1
FunctionalDdd.FluentValidation 2.1.1
FunctionalDdd.RailwayOrientedProgramming 2.1.1
Json.More.Net 2.0.1.2
JsonPath.Net 1.1.0
Microsoft.Agents.AI.Abstractions 1.0.0-preview.251016.1
Microsoft.Agents.Authentication 1.1.151
Microsoft.Agents.Builder 1.1.151
Microsoft.Agents.Client 1.1.151
Microsoft.Agents.Connector 1.1.151
Microsoft.Agents.Core 1.1.151
Microsoft.Agents.Storage 1.1.151
Microsoft.Agents.Storage.Transcript 1.1.151
Microsoft.AspNetCore.Authentication.JwtBearer 8.0.11
Microsoft.AspNetCore.Authentication.OpenIdConnect 8.0.0
Microsoft.AspNetCore.Authorization 8.0.14
Microsoft.AspNetCore.Components 8.0.14
Microsoft.AspNetCore.Components.Analyzers 8.0.14
Microsoft.AspNetCore.Components.Forms 8.0.14
Microsoft.AspNetCore.Components.Web 8.0.14
Microsoft.AspNetCore.Cryptography.Internal 8.0.1
Microsoft.AspNetCore.DataProtection 8.0.1
Microsoft.AspNetCore.DataProtection.Abstractions 8.0.1
Microsoft.AspNetCore.Metadata 8.0.14
Microsoft.Bcl.AsyncInterfaces 9.0.4
Microsoft.Bcl.HashCode 1.1.1
Microsoft.Bcl.TimeProvider 8.0.1
Microsoft.Bot.AdaptiveExpressions.Core 4.22.9
Microsoft.Bot.Builder 4.23.0
Microsoft.Bot.Configuration 4.23.0
Microsoft.Bot.Connector.Streaming 4.23.0
Microsoft.Bot.Schema 4.23.0
Microsoft.Bot.Streaming 4.23.0
Microsoft.CSharp 4.7.0
Microsoft.Extensions.AI 9.10.0
Microsoft.Extensions.AI.Abstractions 9.10.0
Microsoft.Extensions.AI.OpenAI 9.10.0-preview.1.25513.3
Microsoft.Extensions.Caching.Abstractions 8.0.0
Microsoft.Extensions.Caching.Memory 8.0.1
Microsoft.Extensions.Configuration 9.0.1
Microsoft.Extensions.Configuration.Abstractions 9.0.1
Microsoft.Extensions.Configuration.Binder 9.0.1
Microsoft.Extensions.Configuration.CommandLine 9.0.1
Microsoft.Extensions.Configuration.EnvironmentVariables 9.0.1
Microsoft.Extensions.Configuration.FileExtensions 9.0.1
Microsoft.Extensions.Configuration.Json 9.0.1
Microsoft.Extensions.Configuration.UserSecrets 9.0.1
Microsoft.Extensions.DependencyInjection 9.0.6
Microsoft.Extensions.DependencyInjection.Abstractions 9.0.10
Microsoft.Extensions.DependencyModel 8.0.2
Microsoft.Extensions.Diagnostics 9.0.1
Microsoft.Extensions.Diagnostics.Abstractions 9.0.1
Microsoft.Extensions.FileProviders.Abstractions 9.0.1
Microsoft.Extensions.FileProviders.Physical 9.0.1
Microsoft.Extensions.FileSystemGlobbing 9.0.1
Microsoft.Extensions.Hosting 9.0.1
Microsoft.Extensions.Hosting.Abstractions 9.0.1
Microsoft.Extensions.Logging.Abstractions 9.0.10
Microsoft.Extensions.Logging.Configuration 9.0.1
Microsoft.Extensions.Logging.Console 9.0.1
Microsoft.Extensions.Logging.Debug 9.0.1
Microsoft.Extensions.Logging.EventLog 9.0.1
Microsoft.Extensions.Logging.EventSource 9.0.1
Microsoft.Extensions.ObjectPool 6.0.3
Microsoft.Extensions.Options 9.0.6
Microsoft.Extensions.Options.ConfigurationExtensions 9.0.1
Microsoft.Extensions.Options.DataAnnotations 9.0.1
Microsoft.Extensions.Primitives 9.0.6
Microsoft.Extensions.VectorData.Abstractions 9.7.0
Microsoft.Graph 5.74.0
Microsoft.Graph.Core 3.2.4
Microsoft.Identity.Abstractions 9.1.0
Microsoft.Identity.Client 4.76.0
Microsoft.Identity.Client.Extensions.Msal 4.76.0
Microsoft.Identity.ServerAuthorization 4.12.7
Microsoft.Identity.ServiceEssentials.Authentication 1.36.0
Microsoft.Identity.ServiceEssentials.Caching 1.36.0
Microsoft.Identity.ServiceEssentials.Core 1.36.0
Microsoft.Identity.ServiceEssentials.DataContracts.ClaimsOnlyAuthZ 1.36.0
Microsoft.Identity.ServiceEssentials.DataProviders.ClaimsOnlyAuthZ 1.36.0
Microsoft.Identity.ServiceEssentials.Extensions.AspNetCoreMiddleware 1.36.0
Microsoft.Identity.ServiceEssentials.Extensions.AspNetCoreMiddleware.S2S 1.36.0
Microsoft.Identity.ServiceEssentials.Extensions.AspNetCoreMiddleware.S2SWeb 1.36.0
Microsoft.Identity.ServiceEssentials.Modules.ClaimsOnlyAuthZ 1.36.0
Microsoft.Identity.ServiceEssentials.Modules.SettingBasedTokenRevocation 1.36.0
Microsoft.Identity.ServiceEssentials.Modules.TrV2Module 2.6.3
Microsoft.Identity.ServiceEssentials.S2SWeb 1.36.0
Microsoft.Identity.ServiceEssentials.Standard 1.36.0
Microsoft.Identity.ServiceEssentials.Telemetry.Abstractions 1.36.0
Microsoft.Identity.ServiceEssentials.Telemetry.OneCollector 1.36.0
Microsoft.Identity.ServiceEssentials.TokenAcquisition 1.36.0
Microsoft.Identity.ServiceEssentials.TokenAcquisitionIdWeb 1.36.0
Microsoft.Identity.TokenRevocationFromSettings 1.36.0
Microsoft.Identity.Web.Certificate 3.9.4
Microsoft.Identity.Web.Certificateless 3.9.4
Microsoft.Identity.Web.Diagnostics 3.9.4
Microsoft.Identity.Web.DownstreamApi 3.9.3
Microsoft.Identity.Web.TokenAcquisition 3.9.4
Microsoft.Identity.Web.TokenCache 3.9.4
Microsoft.IdentityModel.Abstractions 8.12.1
Microsoft.IdentityModel.JsonWebTokens 8.12.1
Microsoft.IdentityModel.Logging 8.12.1
Microsoft.IdentityModel.LoggingExtensions 8.12.1
Microsoft.IdentityModel.Protocols 8.12.1
Microsoft.IdentityModel.Protocols.OpenIdConnect 8.12.1
Microsoft.IdentityModel.Protocols.SignedHttpRequest 8.12.0
Microsoft.IdentityModel.Protocols.WsFederation 8.12.0
Microsoft.IdentityModel.S2S 4.19.0
Microsoft.IdentityModel.S2S.Configuration 4.19.0
Microsoft.IdentityModel.S2S.DstsExtensions 4.19.0
Microsoft.IdentityModel.S2S.Extensions.AspNetCore 4.19.0
Microsoft.IdentityModel.S2S.ServerAuthorizationExtensions 4.19.0
Microsoft.IdentityModel.S2S.Tokens 4.19.0
Microsoft.IdentityModel.Tokens 8.12.1
Microsoft.IdentityModel.Tokens.Saml 8.12.0
Microsoft.IdentityModel.Validators 8.12.1
Microsoft.IdentityModel.Xml 8.12.0
Microsoft.JSInterop 8.0.14
Microsoft.Kiota.Abstractions 1.17.1
Microsoft.Kiota.Authentication.Azure 1.17.1
Microsoft.Kiota.Http.HttpClientLibrary 1.17.1
Microsoft.Kiota.Serialization.Form 1.17.1
Microsoft.Kiota.Serialization.Json 1.17.1
Microsoft.Kiota.Serialization.Multipart 1.17.1
Microsoft.Kiota.Serialization.Text 1.17.1
Microsoft.OData.Core 8.2.3
Microsoft.OData.Edm 8.2.3
Microsoft.OData.ModelBuilder 2.0.0
Microsoft.OpenApi 1.4.3
Microsoft.Recognizers.Text 1.3.2
Microsoft.Recognizers.Text.Choice 1.3.2
Microsoft.Recognizers.Text.DataTypes.TimexExpression 1.3.2
Microsoft.Recognizers.Text.DateTime 1.3.2
Microsoft.Recognizers.Text.Number 1.3.2
Microsoft.Recognizers.Text.NumberWithUnit 1.3.2
Microsoft.Rest.ClientRuntime 2.3.24
Microsoft.SemanticKernel.Abstractions 1.66.0
Microsoft.SemanticKernel.Agents.Abstractions 1.61.0
Microsoft.SemanticKernel.Core 1.66.0
Microsoft.Spatial 8.2.3
Microsoft.Win32.SystemEvents 8.0.0
ModelContextProtocol.Core 0.3.0-preview.3
Newtonsoft.Json 13.0.3
OpenAI 2.5.0
OpenTelemetry 1.8.1
OpenTelemetry.Api 1.9.0
OpenTelemetry.Api.ProviderBuilderExtensions 1.8.1
OpenTelemetry.Exporter.Geneva 1.8.0
OpenTelemetry.Exporter.OneCollector 1.8.0
PolySharp 1.14.1
Std.UriTemplate 2.0.1
System.ClientModel 1.7.0
System.Collections.Immutable 1.4.0
System.ComponentModel.Annotations 4.6.0
System.Configuration.ConfigurationManager 8.0.1
System.Diagnostics.DiagnosticSource 9.0.10
System.Diagnostics.EventLog 9.0.1
System.Drawing.Common 8.0.0
System.Formats.Asn1 8.0.1
System.IdentityModel.Tokens.Jwt 8.12.1
System.IO.Hashing 6.0.0
System.IO.Pipelines 9.0.2
System.Linq.Async 6.0.3
System.Memory 4.5.4
System.Memory.Data 8.0.1
System.Net.ServerSentEvents 10.0.0-preview.4.25258.110
System.Numerics.Tensors 9.0.8
System.Runtime.Caching 8.0.1
System.Runtime.CompilerServices.Unsafe 4.6.0
System.Security.Cryptography.Pkcs 8.0.0
System.Security.Cryptography.ProtectedData 8.0.0
System.Security.Cryptography.Xml 8.0.1
System.Text.Encodings.Web 9.0.2
System.Text.Json 9.0.2
System.Threading.Tasks.Extensions 4.6.3
System.ValueTuple 4.4.0
T4.Build 0.2.4

The same values are provided in a console app and it works as expected. in case of wrong api key, it properly throws 401 code.

To Reproduce
It is "personal" chat in teams app. Following is the code in working and not working setup.
Same exact code in "working" and "non-working" case because we kept it in a class library:

    var deploymentId = "gpt-5"; // our model and deployment name are same

#pragma warning disable CA2208
string? apiKey = ""; // with valid value
//string? apiKey = "wrongkey" // wrong value
?? throw new ArgumentException("Environment variable 'OpenAI:ApiKey' is missing.", "OpenAI:ApiKey");
#pragma warning restore CA2208

_aiAgent = new AzureOpenAIClient(new Uri("https://<>>>.openai.azure.com/"), new AzureKeyCredential(apiKey))
.GetChatClient(deploymentId)
.CreateAIAgent(instructions: ""); //our prompt instruction text
}

public async Task<QHubAIAgentResponse> GetChatResponseAsync(string userInput)
{
    Console.WriteLine($"[INFO] Getting agent response for input: {userInput}");

    try
    {
        var response = await _aiAgent.RunAsync(userInput)!;

Expected behavior
It should work when the provided values are correct as it is working in the console app scenario.

Screenshots

Additional context
Add any other context about the problem here.

[brwilkinson]

can't see the subscribe button, so comment to follow.

[brwilkinson]

wondering what the correct token scope is?

• https://devblogs.microsoft.com/dotnet/introducing-microsoft-agent-framework-preview/
  • A GitHub Personal Access Token (PAT) with models scope
• https://learn.microsoft.com/en-us/agent-framework/tutorials/quick-start?pivots=programming-language-csharp#optional-install-nightly-packages
  • Create a GitHub Personal Access Token with the read:packages

[markwallace-microsoft]

@brwilkinson The 404 is returned from the service and indicates the resource is not available. Have you tried calling the REST API directly to validate the resource does exist?

[MSRY]

Add @vineel ***@***.***> to provide more context.

…

________________________________ From: Mark Wallace ***@***.***> Sent: Tuesday, October 28, 2025 9:23 AM To: microsoft/agent-framework ***@***.***> Cc: Ren Yu ***@***.***>; Author ***@***.***> Subject: Re: [microsoft/agent-framework] .NET: Microsoft.Agents.AI is giving 404 Resource not found although the input values are correct. (Issue #1692) [https://avatars.githubusercontent.com/u/127216156?s=20&v=4]markwallace-microsoft left a comment (microsoft/agent-framework#1692)<#1692 (comment)> @brwilkinson<https://github.com/brwilkinson> The 404 is returned from the service and indicates the resource is not available. Have you tried calling the REST API directly to validate the resource does exist? — Reply to this email directly, view it on GitHub<#1692 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AHDH56AIMG4IR6XWRLCLQ433Z6J6PAVCNFSM6AAAAACKFMLHSCVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTINJXGM3DAMZYGA>. You are receiving this because you authored the thread.Message ID: ***@***.***>

[MSRY]

The same code (with exact resource URL) referenced via a class library was working fine from a console app. Now, It worked when I created a separate class library within the same solution. Regards, VINEEL

…

________________________________ From: Ren Yu ***@***.***> Sent: Tuesday, October 28, 2025 9:25 AM To: microsoft/agent-framework ***@***.***>; microsoft/agent-framework ***@***.***>; Vineel Madamanchi ***@***.***> Cc: Author ***@***.***> Subject: Re: [microsoft/agent-framework] .NET: Microsoft.Agents.AI is giving 404 Resource not found although the input values are correct. (Issue #1692) Add @vineel ***@***.***> to provide more context.

________________________________ From: Mark Wallace ***@***.***> Sent: Tuesday, October 28, 2025 9:23 AM To: microsoft/agent-framework ***@***.***> Cc: Ren Yu ***@***.***>; Author ***@***.***> Subject: Re: [microsoft/agent-framework] .NET: Microsoft.Agents.AI is giving 404 Resource not found although the input values are correct. (Issue #1692) [https://avatars.githubusercontent.com/u/127216156?s=20&v=4]markwallace-microsoft left a comment (microsoft/agent-framework#1692)<#1692 (comment)> @brwilkinson<https://github.com/brwilkinson> The 404 is returned from the service and indicates the resource is not available. Have you tried calling the REST API directly to validate the resource does exist? — Reply to this email directly, view it on GitHub<#1692 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AHDH56AIMG4IR6XWRLCLQ433Z6J6PAVCNFSM6AAAAACKFMLHSCVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTINJXGM3DAMZYGA>. You are receiving this because you authored the thread.Message ID: ***@***.***>

[rogerbarreto]

@MSRY We recommend moving away of using the Azure.AI.OpenAI package.

Please use the latest OpenAI package.

To be able to use the client you need to set your code something like this:

- _aiAgent = new AzureOpenAIClient(new Uri("https://<>>>.openai.azure.com/"), new AzureKeyCredential(apiKey))
+ _aiAgent = new OpenAIClient(new ApiKeyCredential(apiKey), new OpenAIClientOptions { Endpoint = azureOpenAIEndpoint })
.GetChatClient(deploymentId)

Let me know if that works for you.

Thanks