If I read it right it sounds even worse. Fedex allows the characters and then random stuff just breaks.

It is much preferred to get a simple "only english alphabet and numbers please" warning message when you are trying to set the password than not getting any warning and then things breaking.

I meant broke in the sense of "if it ain't broke, don't fix." If there are over 300 microservices running code, connected to mainframes running code that was originally from the 80s, but they occasionally have password issues - the risks caused by trying to fix it might be greater than it's worth.

That doesn't mean FedEx can't do a better job telling people not to use special characters - or detecting if their current password contains them and forces a password change.