I bought the Java version of Minecraft today, but I can't access the multiplayer. A message comes up that the multiplayer is switched off and I should check my Microsoft settings. On the Microsoft website I'm always redirected to the same page. What can I do?
Your parents may have some kind of parental controls on.
As far as I know, the Java version does not have such limitations in connection with the Microsoft account.
Maybe I missed the news too. Something was planned with the MC-Java accounts to Microsoft accounts.
Jup perfectly correct
https://www.minecraftforum.net/...check-your
Log in to the Microsoft account used and allow multiplayer in the Xbox One / Windows 10 Online Safety Tab.