azure-ad-plugin does not work with azure-commons-plugin 0.2.7 which is just released yesterday (show attachments). With 0.2.6 it can work. I'm not sure whether this is only our environment or not.
The stack trace shows the relation to the following library.
https://bitbucket.org/nimbusds/oauth-2.0-sdk-with-openid-connect-extensions/src/master/