Does Minecraft + Microsoft account on OpenBSD work?

Hi,

Minecraft Java Edition can be easily installed on OpenBSD using the
games/minecraft port (see e.g. https://openports.se/games/minecraft).
Before I buy the game, which at 17.95 GBP is reasonably priced IMHO, I
wanted to ask the OpenBSD community whether anyone has been able to get
the Minecraft port to work using a Microsoft account: Since 1 December
2020 one needs a Microsoft account to buy and play Minecraft Java Edition.

I have attempted to start the games/minecraft port in demo mode using
the instructions posted at https://minecraft.fandom.com/wiki/Demo_mode:
Supposedly passing the --demo argument to minecraft.jar should launch
the demo. Assuming these instructions are correct, I have not been able
to log in to Minecraft using my Microsoft account despite registering
the account for a free trial.

Would anyone know the magic trick to play Minecraft Java Edition on
OpenBSD using a Microsoft account?

Cheers,

Mark