Title says it all. Consistently I don't see some friends online that are playing Destiny, even though I can see that they are playing Destiny at Xbox.com. I can send them a message and they verify that they are playing Destiny. Sometimes mutual friends can see them, but then others won't be able to see them as well as me.
What is this? How many other people are dealing with this? And is there any way to fix it. My router has all the appropriate ports open manually, etc etc. one Xbox One in household that is attached via cable, not wireless.