Minecraft Java: online games not working?

Hy
3

If I want to press the "Multiplayer" button on the MC Java Edition for the PC, the following message appears: The multiplayer mode is deactivated. Please check the settings of your Microsoft account. Where can I activate the mode? I've already checked my Microsoft account, but couldn't find a way.

hu

Check times whether you have downloaded the latest Java version.

Hy

Yes, the Minecraft launcher says I have the latest version

Gu

Do you have 1.16.4?

And no demo version?

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