Signature Failure after upgrade to licensed version

Just installed the licensed version (4.1) And now getting:
SamlSignatureException: Neither the SAML response nor assertion is signed. ComponentSpace.Saml2.SamlServiceProvider.VerifySamlAssertionSignatureAsync(AssertionListItem assertionListItem)

What would be the cause ? Where should I look ?

Changed nothing else. This is within the example solution
Full trace:

By default, we expect either the SAML response or SAML assertion to be signed.

You should contact the partner identity provider and request that they sign either the SAML response or SAML assertion.

If there’s still an issue, please enable SAML trace and send the generated log file as an email attachment to