invalid_client

Hello Rajan,

Try the following steps to fix this: 

1. Check the error message from the server for more details about the issue.
2. Ensure that your application registration in the Azure portal is properly configured with the required authentication settings.
3. Make sure that you are passing the correct credentials and parameters in your authentication request.
4. Check the logs for any additional error messages or details that can help you diagnose the issue.
5. If you are still unable to resolve the issue, consider reaching out to Microsoft support or a qualified developer for assistance.

Check this thread.

https://stackoverflow.com/questions/45609432/how-do-i-resolve-the-error-aadsts7000218-the-request-body-must-contain-the-foll

Hello Rajan

To resolve this issue, you will need to update the authentication configuration for your BizTalk Server application in the AAD portal. Here are the steps you can follow to do this:

1. Log in to the Azure portal and navigate to the Azure Active Directory service.
2. Select "App registrations" and find the application that is encountering the authentication error.
3. Click on the application to open its registration page and navigate to the "Certificates & secrets" tab.
4. If you are using a client secret, make sure that it has not expired and regenerate a new one if necessary.
5. If you are using a client assertion, ensure that it is correctly included in the request body.
6. After updating the authentication configuration, try to authenticate again and check if the error has been resolved.

Thanks