I can't access my friends' worlds

You might have to check your router settings and open some ports, or have your friend open some ports.

Try opening ports: 19132, 19133, and 25565

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.

If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.

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