I can't join my friends worlds with or without an invite on Minecraft and I don't understand why, I have bought Xbox live gold and was playing peacefully in the past but, on one day I was disconnected from the world and I wasn't able to join any worlds.
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You should check Xbox networking to see that Xbox live multiplayer is not Strict or Moderate NAT

Thank you for your report!
We're actually already tracking this issue at MCPE-36190, so I will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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