So I asked this question over on the audiogames.net forum, but I received no response so I'm coming here.
First, is it possible to add a friend by searching for their username? Or do I need their email or phone number?
Next, am I the only one experiencing a bug in iOS 15.1 when trying to navigate Game Center settings with Voiceover that causes the app to crash?
By Rich, 17 November, 2021
iOS and iPadOS Gaming
RE: Question 1
Based upon this Apple support article, it appears that you can only Enter a phone number or email address, or tap the Add button to invite one of your contacts.
As for the crashing issue, I don't use Game Center so hopefully somebody else will be able to confirm this for you.
No crash reports here, sorry!
I've experienced no game center crashes, so sorry about not being able to help.