I recently bought a copy of Minecraft from minecraft.net using my Microsoft account. Singleplayer games function perfectly, however, whenever I attempt to join a server I get a message saying either "Your account could not be authenticated! (Try relogging)" or "Not authenticated with minecraft.net" or "Failed to verify username!".
I have attempted to try logging in and out, as well as using a number of different game versions and servers, but the problem persists.
This report is a duplicate of MC-207896. I'd recommend reading through the Mojang Notice attached to the duplicated link in order to fix this problem and if the issue still persists after following the provided instructions, please contact Community Support as the bug tracker is unable to provide you with assistance.