33.12.6 A Specific Claim Does Not Come to the UserInfo Endpoint during Claims Request

Whether the user has a value for that attribute. If the value is empty, UserInfo does not return any value in JSON.

The Identity Sever has provided the requested scope. You can check this with the TokenInfo endpoint by providing an Access token.

(Conditional) For the client credentials flow, the Require user permission option is deselected.