Minecraft always says that I should activate the multiplayer mode in my settings. How do I do that?

Hello me and my buddy want to play Bedwars together on a Minecraft server. Our problem now is that my buddy says that the multiplayer mode is deactivated. How can he activate it?

Java or Bedrock?

Java

You can't deactivate that at all. Or is it?

Does he go to multiplayer?

When does the message come?

I googled that. This message is only available from Bedrock, not from Java

He presses multiplayer and the message comes straight away

Sure it's Java?

You can't turn it off. He was banned. Did he use cheats on the server?

He just bought Minecraft today

Yes

On which device? PC?

The message is now also available in the Java Edition when you create a new JE account.

Of course you can deactivate it, it is there.

Ohh ok, I didn't know that. My account is very old xD

How?

Somewhere in the Microsoft account settings.