As seen on the Title after you create or join worlds the option is on disabled this should be checked due to the fact I cannot invite anyone in game I have attached a screenshot just to check it for yourself
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This Bug still exists on the current version

Thank you for your report!
We're tracking this issue under MCPE-43626 so I've requested this report be resolved and linked 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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