Minecraft - no connection to the world?

I don't have much idea, but I still try.
My daughter (iPad) wants to network with a friend (SamsungTab) via or in Minecraft and play together in one world.
The friendship worked, she also receives invitations from him, but there's always "no connection to the world" - why is that?
also the independent entry into his world does not work. Same hint as after an invitation.
in both stands v.1.14.60. / not on the same network

we would be grateful for helpful answers:-)

This is often the case with me. It should work if both minecraft close again

I also know little about it, but the error message sounds like they want to connect via the local network. Is there maybe an option with which you can switch from local to global?

Not that I know of. We'll try restarting the apps tomorrow. But thanks first

Thank you first for the answer. We'll try again tomorrow. Bedtime for the kids ;-)

Gladly ^^