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Power Automate Custom Connector - Token Invalid Invalid Audience



I have built a few custom connectors before but for some reason am having real issues getting a custom connector to authenticate against an api i have written. 


The API is written in .netcore 5, hosted as a WebApp in the same tenant i am trying to connect from. I've checked the authentication setup and the ClientId is pointing to the 37008370 clientid guid in the below image.


Security Setup.png

I've connected to this API using a blazor app so I think authentication is setup correctly.


When I try and setup the authentication for a custom connector though I get the following response


  "content-length": "0",
  "date": "Wed, 20 Oct 2021 10:11:51 GMT",
  "request-context": "appId=cid-v1:4e1e4b6a-ace8-48e9-8121-546d6e834953",
  "www-authenticate": "Bearer error=\"invalid_token\", error_description=\"The audience 'api://37008370-*********' is invalid\"",
  "x-ms-apihub-cached-response": "false",
  "x-powered-by": "ASP.NET"


I think I have setup everything correctly and cant see where I am going wrong.

Any help appreciated.




Pleas confirm your auth mechanism is set up correctly by invoking the API from PostMan first. If that's working you can retry the custom connector.

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