I have a friend that is experiencing the same problem for version 1.16.201. We tried different emails in hopes that one of them associates with the username that it was providing, but none of them worked. We also tried re-installing Minecraft, and we didn't have any options to unlink an account. We ran out of ideas here and don't know what more we can do. I'm trying to get my friend to be able to join servers with me.
I have a friend that is experiencing the same problem for version 1.16.201. We tried different emails in hopes that one of them associates with the username that it was providing, but none of them worked. We also tried re-installing Minecraft, and we didn't have any options to unlink an account. We ran out of ideas here and don't know what more we can do. I'm trying to get my friend to be able to join servers with me.