Can not view or download Service Provider Metadata

[DaS-hpolbb]

What happened?

Our Moodle Version is 4.4.3
SAML2 auth_saml2 version 2024071101

When trying to display the service provider metadata (View Service Provider Metadata) we get the following error:

Website Administration > plugins (authentication) > SAML2
URL: https://moodle.example.de/auth/saml2/sp/metadata.php

ERROR: authsources['moodle.example.de']: Could not retrieve the required option 'description'.

Please provide as many of the following as applies:

• stacktrace of the error

Stack trace: 
line 363 of /auth/saml2/.extlib/simplesamlphp/vendor/simplesamlphp/assert/src/Assert.php: SimpleSAML\Assert\AssertionFailedException thrown
line 381 of /auth/saml2/.extlib/simplesamlphp/src/SimpleSAML/Configuration.php: call to SimpleSAML\Assert\Assert::__callStatic()
line 900 of /auth/saml2/.extlib/simplesamlphp/src/SimpleSAML/Configuration.php: call to SimpleSAML\Configuration->getValue()
line 161 of /auth/saml2/locallib.php: call to SimpleSAML\Configuration->getArray()
line 51 of /auth/saml2/sp/metadata.php: call to auth_saml2_get_sp_metadata()

• a dump of the error log with both moodle debugging on full and saml debugging on as well
  NGINX error.log

2024/11/07 13:15:44 [error] 973#973: *6597 FastCGI sent in stderr: "PHP message: Default exception handler: Fehler: authsources['moodle.example.de']: Could not retrieve the required option 'description'. Debug:
Error code: generalexceptionmessage
* line 363 of /auth/saml2/.extlib/simplesamlphp/vendor/simplesamlphp/assert/src/Assert.php: SimpleSAML\Assert\AssertionFailedException thrown
* line 381 of /auth/saml2/.extlib/simplesamlphp/src/SimpleSAML/Configuration.php: call to SimpleSAML\Assert\Assert::__callStatic()
* line 900 of /auth/saml2/.extlib/simplesamlphp/src/SimpleSAML/Configuration.php: call to SimpleSAML\Configuration->getValue()
* line 161 of /auth/saml2/locallib.php: call to SimpleSAML\Configuration->getArray()
* line 51 of /auth/saml2/sp/metadata.php: call to auth_saml2_get_sp_metadata()" while reading response header from upstream, client: x.x.x.x, server: moodle.example.de, request: "GET /auth/saml2/sp/metadata.php HTTP/1.1", upstream: "fastcgi://127.0.0.1:9081", host: "moodle.example.de", referrer: "https://moodle.example.de/admin/settings.php?section=authsettingsaml2"

The attempt to download the service provider metadata also ends in an error:

https://moodle.example.com/auth/saml2/sp/metadata.php?download=1

HTTP ERROR 404 > ERR_INVALID_RESPONSE

What you expected:

That we can see the service provider metadata.