Get-AzRecoveryServicesVault Error -> Could not load file or assembly 'Microsoft.Azure.PowerShell.Authentication

[shaisundar]

Creating new issue as requested <linked to issue - https://github.com/Azure/azure-powershell/issues/12230>

ARM deployments failing on win 2019 MS Hosted Image.
(Currently, things are working on VS2017-win2016 MS HOsted image.)

We just checked the logs in win2019 image and this is what we found -

[command]Import-Module -Name C:\Modules\az_4.3.0\Az.Accounts\1.9.1\Az.Accounts.psd1 -Global

##[error]Operation failed.
Could not load file or assembly 'Microsoft.Azure.PowerShell.Authentication, Version=1.9.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.

Its failing although it has a later Az.Accounts module, (2.10.0)
We suspect Its failing because its somehow trying to look for Microsoft.Azure.PowerShell.Authentication, Version=1.9.0.0.

So we suspect that this issue will resurface even on win 2016 after the next update.

Requested files uploaded - after listing powershell modules present.

• and the debug az module file.

3_Azure PowerShell script InlineScript.txt
3_Azure PowerShell script InlineScript (1).txt

[shaisundar]

@dingmeng-xue - Here is a new issue with the details you requested.

[dingmeng-xue]

Hi both, is your issue related to Get-AzRecoveryServicesVault?

[Gitrathirad]

Yes, while executing Get-AzRecoveryServicesVault we get this error.

[Gitrathirad]

We get the error while executing Get-AzRecoveryServicesVault. Sharing the workaround again with the new screenshot:

Error:
Operation failed. Could not load file or assembly 'Microsoft.Azure.PowerShell.Authentication, Version=1.9.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.
Cannot validate argument on parameter 'Vault'. The argument is null or empty. Provide an argument that is not null or empty, and then try the command again.
Work around:

[dingmeng-xue]

I tried vs2017-win2016 with below scripts in PowerShell script task and cannot see problem. Please try below code in your task and share me output.

Install-Module -Name Az.Accounts -RequiredVersion 1.9.0 -Force
Install-Module -Name Az.RecoveryServices -RequiredVersion 2.10.0 -Force
Get-Module Az*
try {
  Get-AzRecoveryServicesVault
}
catch {
  Write-Host "An error occurred:" $_
}
Get-Module Az*

Default expected result is below. It's correct in my env that I didn't execute connect azaccount.

2020-07-24T07:28:48.9445775Z WARNING: Both Az and AzureRM modules were detected on this machine. Az and AzureRM modules cannot be imported in the 
2020-07-24T07:28:48.9449450Z same session or used in the same script or runbook. If you are running PowerShell in an environment you control you can
2020-07-24T07:28:48.9450753Z  use the 'Uninstall-AzureRm' cmdlet to remove all AzureRm modules from your machine. If you are running in Azure 
2020-07-24T07:28:48.9452313Z Automation, take care that none of your runbooks import both Az and AzureRM modules. More information can be found 
2020-07-24T07:28:48.9453357Z here: https://aka.ms/azps-migration-guide
2020-07-24T07:28:50.5176948Z An error occurred: Operation failed.
2020-07-24T07:28:50.5179750Z Run Connect-AzAccount to login.
2020-07-24T07:28:50.5289653Z 
2020-07-24T07:28:50.5319978Z ModuleType Version    Name                                ExportedCommands                                             
2020-07-24T07:28:50.5337053Z ---------- -------    ----                                ----------------                                             
2020-07-24T07:28:50.5445895Z Script     1.9.1      Az.Accounts                         {Add-AzEnvironment, Clear-AzContext, Clear-AzDefault, Conn...
2020-07-24T07:28:50.5774002Z Script     2.10.0     Az.RecoveryServices                 {Add-AzRecoveryServicesAsrReplicationProtectedItemDisk, Ba...

[Gitrathirad]

I will be sharing the results of the script shortly. Is it possible to ensure C:\Modules\az_4.3.0\Az.RecoveryServices\2.10.0\ works with any newer version of Az.Accounts module not just 1.9.0. If not can we have note on the below site mentioning the pre-requisite of the version of Az.Accounts required by Az.RecoveryServices

https://docs.microsoft.com/en-us/powershell/module/az.recoveryservices/Get-AzRecoveryServicesVault?view=azps-4.4.0

[dingmeng-xue]

2.10.0 and previous version of Az.RecoveryServices reference an incorrect assembly. This issue shows up when we upgrade Az.Accounts. As the result, old version of Az.RecoveryServices cannot use the new version of Az.Accounts.

Az 4.4.0 online doc is for Az.RecoveryServices 2.11.0. If user install 2.11.0, it should have no the same problem in the future even user only upgrade Az.Accounts. It's why we didn't find a place to doc it.