Can't see or join Xbox friends from PC


I play on PC (steam version) and have a couple of friends who play on Xbox. They both appear online within the Xbox app but not in the sim. I can’t even find them under the disconnected tab. The only way to join them is through the world map and selecting the same server, however this isn’t ideal when trying to fly in congested areas where there are many other people online, as they sometimes disappear.

Is there something I’m missing?
Any advice would be helpful, thanks.

Also suffer from this same issue!