Changing Email Address Login Error

So I am trying to change my email address by going to settings -> profile information -> email, but logging in using a different email account gives me a login error, and after a while the email in my profile information reverts to the previous one.

Is it possible to fully change the email address?

The issue is that I can’t log in with google using the new email account, any clue how to fix that?

You might want to message a mod/dev directly, where you could put the emails in question but still keep them private.