Pls Help me Shared Server (Grounded)

[Snoop]

Hi, Good morning. How do I play on my friend's save? He created and shared it with me and others, but only I can't see the server, my other friends can play even with the owner Off, while I can only play if they invite me... (Platform App xbox PC) !! Sorry for the mistakes I'm from Brazil.
The idea was for me to play with the owner of the offline server, but I can't even share it with me, I can only do it if he or another friend invites me.. The funny thing is that it appears to others and not to me.