@Korina Sorry for my late reply. I am still having issues. One time the login worked using my username - see above. But now I logged out again to test with my email, and I am unable to log in again, no matter if im using the username or mail address. Passwort is correct, I double-checked that.
(Newest versions of everything. Paid user as well, btw.)
Just an idea - it may be that I have changed my email address over time, because the old one is not in use any more. Just guessing that this might have something to do with the issue? But then, I cannot log in using the username as well.