Nifi Google SAML implementation

[#1]

When implementing Google SAML with Apache NiFi 1.15 we get the following error on startup.

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'samlService' defined in org.apache.nifi.web.security.configuration.SamlAuthenticationSecurityConfiguration: Invocation of init method failed; nested exception is java.lang.RuntimeException: Unable to initialize SAML configuration due to: org.opensaml.saml2.metadata.provider.MetadataProviderException: Non-ok status code 400 returned from remote metadata source https://accounts.google.com/o/saml2/idp?idpid=xxxxx

Is this caused by a misconfiguration in Nifi or on the Google configuration side? 

There's alot of documentation on what the SAML parameters mean, but unfortunately no expamles can be found on the net.

Thank you in advanced.

Kind regards,

Dave

[#2]

@Dave0x1 ,

Would you be able to share your current configuration?

Cheers,

André