Identical Outlook Account exists

I had an issue last week, woke up and my mail had 5 emails, no sender from 1969. After some googling, one of the solutions that worked was deleting my mail app and re installing.

Now my mail app will not let me login, saying that an identical outlook account already exists. When googling this problem, most of the solutions involve options in the mail settings I don’t see (ie preferences, etc)