Multiplayer problem

I try to invite my brother from my Android phone and my invitation, from my PC, does not seem to pop-up, in my phone, in the game nor the Xbox App. I have separate accounts from my PC and my phone and I don't know what the problem is. I tried to go to on both Xbox account's privacy settings and change some of the settings, but it did not work. I looked up online for any solutions, but they did not work either. Both devices have the same version of Minecraft and LAN doesn't work either. Is this a bug? Or is it a problem with my account?