Please upgrade to 2.2 here.
The 2.0 and 2.1 branches are no longer being updated.
Sign In With Google Plugin Not Working
I enabled both openid and google plugin then went to settings for each and enabled that as well. I can click through to openid but not with google.
Here's the error message on vanilla 2.0.16:
Method Not Implemented
GET to /entry/openid not supported.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.