I can no longer join my friend on Minecraft (bedrock)?

de
2

I often play Minecraft with a friend (me on the mobile phone, he on the switch) and everything always worked out, but since I got Minecraft Java edition for the laptop with the same Windows account, I can use my mobile phone to my friend no longer join. I can no longer find his gamertag either.

Does anyone have any idea how I can fix this?

Nu

And are you serious?

de

Why shouldn't it be serious?