MHA accounts are region locked!
EU accounts are only playable on EU version of the app (My Hero Academia: The Strongest Hero)
NA accounts are only playable on NA version of the app (My Hero Academia: The Strongest Hero Anime RPG)
You'll have to provide me a Google or Facebook unlinked account (email and password), i'll link it immediatly, then you just have to use those IDs to log in and access your account. Facebook account must be more than 1 hour old