Board Thread:General Discussion/@comment-174.0.230.10-20200830005720/@comment-45117243-20200830010933

Maybe you are underaged according the the birth year you gave, maybe you tried a username with problematical characters, and maybe it's just a problem on Fandom side.

Yes, wait a while and try again. If that doesn't help, contact Fandom support. Leave the "username" field empty since you don't have one, but make sure to give a real email.