I migrated my account to a Microsoft account because I got the notification to do so. After creating the new account, I got an email saying that it was successfully migrated to a Microsoft account. I went back into the launcher to play the game, and I wasn't able to log in to my account whatsoever. I know I was using the correct username and password. When I try to log in to minecraft.net, I get this message that pops up saying "an error has occurred".

What I expected to happen was...: 
To be able to log into the launcher with my Microsoft account.

What actually happened was...:
I couldn't log in to any account