But luckily for some reason, iOS Authy generates the same codes a wee bit faster than desktop Authy. Just, and I mean _just_ barely fast enough to not have already been discarded by the Geekzone login server.
I understand the need to discard old 2FA codes, but maybe you should wait for at least a full minute, yeah? :-) This is the very first time I've ever encountered a login server this ultra-zealous with 2FA code discarding. It's kind of funny, but was also really quite annoying till I figured out what the issue was.
Anyway: FYI to the site admins!