Launcher requires user name but cannot create profile

I have installed the Linux 5.16.11-76051611-generic 2.2.11106 and purchased Minecraft under my Microsoft account. When I click Play, it wants me to enter a username. I have tried both my Xbox gamertag and new available names. When I click Confirm, it tells me it cannot create profile. I have also tried to edit Manage Minecraft: Java Edition Profile/Set up profile. There, I can enter a username, but when I click "That's me" nothing happens.