When we try to play multiplayer that isnt LAN, we cant access each other's worlds even though we've checked our internet connection and made changes to account security. But one of my friends can join our worlds but we cant join his. This bug is also in the 1.14 version, as we've tested and got the same results.
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Thank you for your report!
We're actually already tracking this issue in MCPE-36190, so I've resolved and linked 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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