Cross Platform friends dont appear and not able to add anybody

So I am unable to see any of my cross platform friends and I know i have them added because they can still join me on occasions,but sometimes they are completely unable to join and i cant invite them because it just says you havent added anyone to your cross platform friends list,and when i try to add them the add button just continuosly refreshes and doesnt end up adding them. So in short all my cross platform friends dot appear and when I try to re add them it does not work.