I have purchased Minecraft Java Edition for my Dell PC. I also purchased a monthly renewable subscription to Minecraft Realms for up to 10 players. Lastly, I setup a Microsoft XBox Live account which I understood is necessary to invite other players using other platforms/devices. My grandson has Minecraft on his iPAD.
We have a Microsoft family account and my grandson, daughter, and me are all on it. My grandson is only seven, but we set his security to allow him to communicate with friends, and accept gaming requests from friends. When we are both logged into XBox Live, we can now see each other as friends/followers.
When I go into my Realm and try to send an invite to my grandson, I get a message that says it cannot send an invite to the person that I typed in. I am typing in his gametag. What am I doing incorrectly? Why can't I invite him into my realm so that we can play Minecraft together. It is supposed to be our grandpa/grandson bonding activity.