kammers

I have encountered the same issue and resolved it.
it is not the bug.

All you have to do is deleting whitespaces in the client id field and re-generating the URL in the step2.

Whitespaces is converted into ‘%20’ character.
So you can confirm the resolution by deleting ‘%20’ from the URL that you posted.

below could be the correct URL.

https://accounts.google.com/o/oauth2/auth?response_type=code&access_type=offline&client_id=755122220164-jk4s2lqocgvkumou32v65f4ecsgqked1.apps.googleusercontent.com&redirect_uri=http%3A%2F%2Fbiausser.fr%2Fwp-admin%2Foptions-general.php%3Fpage%3Dphoto-express&scope=https%3A%2F%2Fpicasaweb.google.com%2Fdata%2F+http%3A%2F%2Fpicasaweb.google.com%2Fdata%2F