Title says it all.

This is a new bug, last few days, caused simply by Microsoft switching the version of TLS used for their authentication servers to TLS 1.3 rather than TLS 1.2

The launcher (any, the older one or the newest) says at the bottom "Oh noes! Something went wrong and we couldn't connect to the Minecraft services".

I can now only play the game offline.

Do NOT mark this is a duplicate. This is a new issue, from the last few days.

As an aside, I also answer Mojang support queries through a third party company subcontracted to do so. I'm seeing hundreds upon hundreds of people affected by this the last few days. Infuriating just as much for me as them.

I know what the fix is - there is only one fix. Microsoft need to reenable TLS 1.2 on their servers. It's that simple.

Eagerly awaiting some response on this...