System.Private.CoreLib: Exception while executing function: Functions.[funcNameHere]. Microsoft.IdentityModel.Clients.ActiveDirectory: Value cannot be null. Parameter name: authority.

[alexkolson]

I've followed the instructions for setting the graph token binding while developing locally and am passing in the id_token as the value of the aad token header. Yet I still get:

[07.02.19 23:07:02] System.Private.CoreLib: Exception while executing function: Functions.myFuncName. Microsoft.IdentityModel.Clients.ActiveDirectory: Value cannot be null.
[07.02.19 23:07:02] Parameter name: authority.

What does this mean and how do I fix it?

Thanks!

[alexkolson]

I should add my function works great if triggered at it's azure url, I just cant seem to get it to work locally.

[elksson]

I am having this same issue when the azure function is triggered from azure not locally.

[psutradhar]

Any update on this ticket? I am getting kind of the same error when I run my function locally.
I am getting,

System.Private.CoreLib: Value cannot be null.
Parameter name: s.

[khowling]

If you are developing locally with the token binding, you need to set local settings to tell the function runtime how to federate with AAD. Add the following to your local.settings.json Values object:

"WEBSITE_AUTH_CLIENT_ID": "xxx",
"WEBSITE_AUTH_CLIENT_SECRET": "xxx",
"WEBSITE_AUTH_OPENID_ISSUER": "https://sts.windows.net/xxx"