Minecraft Java online player not working?

I bought Minecraft Java for my son, which runs on his Microsoft account. When he started the game the message came that the multiplayer is deactivated. I then changed the age of his microsoft account, but it still doesn't work, even after restarting the louncher and the game several times.

Does the update of the microsoft account just take a few hours or is it something else?

LG and thanks in advance

Please refer:

https://answers.microsoft.com/...bb5cbdc997

https://help.minecraft.net/hc/en-us/articles/360042649591-I-m-trying-to-set-up-an-Xbox-Live-or-Microsoft-Account-including-Realms-access-for-Child-Accounts-#:~:text=Log%20in%20to%20https%3A%2F%2F,clubs%22%20(picture%201%20below)

Thank you, that worked!