Joinable friends won't show up on my friends tab. I play on PC and my friend plays on PS4. We both have  each other as friends on Microsoft (obviously). He has all the multiplayer settings set to "friends of friends". but when he loads his world, it does not show up on my friends tab.  He has to restart several times for me to see. Also when he invites me to his world I receive no notification what so ever (checked on xbox app everytime).

Every time  I leave his world it just disappears from my friends tab.