My kids and I are having this issue. We have a world on an Xbox One and my kids join via their tablets, as this helps with lag and we don't have to play with the split screen. Since the latest update, 1.20.51 we have started having issues. On the Xbox, I cannot see them as friends in the Minecraft game menu (although I do see them as online in the Xbox menu). They can see my world briefly and then it goes away. We've figured out that they can join the world if they do so while the world is loading on the xbox. If they don't join right away, or if they get out of the world, it does not show up for them to join again. I also play on a tablet and we have no problems seeing each other or joining worlds from tablet to tablet. For us, it is only a problem of Xbox to tablet and vice versa.
levidunn
My kids and I are having this issue. We have a world on an Xbox One and my kids join via their tablets, as this helps with lag and we don't have to play with the split screen. Since the latest update, 1.20.51 we have started having issues. On the Xbox, I cannot see them as friends in the Minecraft game menu (although I do see them as online in the Xbox menu). They can see my world briefly and then it goes away. We've figured out that they can join the world if they do so while the world is loading on the xbox. If they don't join right away, or if they get out of the world, it does not show up for them to join again. I also play on a tablet and we have no problems seeing each other or joining worlds from tablet to tablet. For us, it is only a problem of Xbox to tablet and vice versa.