Hello everyone,
I'm facing the same problems and not getting to the correct solution.
The current error message is:
Unable to validate Response, see SAMLRequest overview for detailed response. Error: org.opensaml.saml.common.assertion.AssertionValidationException: Assertion Conditions are not met. This Service Provider application is not part of the designated audience list.
I guess I'm doing something wrong in Entra administration. In the link which is linked in the answer above I cannot find the correct answer. Any hint?