The information in this article can help you when the nickname from a User profile on Nintendo Switch is displayed as question marks or you receive one of the following messages while starting or resuming software:
One or more nicknames cannot be used and will now appear as "???"
The "???" nickname can be changed on the player’s user page.
This nickname cannot be used.
Your nickname will display as "???" if it contains inappropriate, harmful, or otherwise unaccepted words.