Local Network playing not working ( Other Games work local)

Cant join a local world of a friend on the switch.

Error Code 2203-0065 " cant connect to other console"  when trying to connect to the world

Both consoles show internet typ B

Pencil at the world doesn't allow multiplayer options to be changed. It's greyed out

Nintendo Support told me to contact you directly, because local network mode works in other games

Tried everything I found on the web like :

• Switch same software version ( latest)
• Switch cache reset
• Switch restart
• Minecraft same software versions
• Reinstalling Minecraft
• Network Router restart
• Network Router default settings and updates
• Different Network
• 2,4 Wifi Downstream 26mbits and upload 6mbits
• Consoles side by side

Any Ideas how to fix this?

Many thanks in advance