@MojangSupport My minecraft account worked fine until Microsoft started merging everyone's account. Now I cannot access my account. Essentially, Microsoft stole my minecraft account. I bought it way back before there were pumpkins or poppies.

If you're having any trouble accessing the full game after migrating your account, remember to use the Microsoft login option with the account that you migrated with, and make sure to remove your old Mojang account from the launcher. See our FAQ: bit.ly/3AUxIQO. ^FF

The problem was that I was being prompted to sign in using my email address instead of using my minecraft screen name. Once I did that, everything went fine. Thank you!