When I go to join my friend's world, the world appears on the menu and I click it. It loads and the and error appears saying 'Invalid Name'. I have changed my username and my friend has changed his username but the roof doesn't change.
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is duplicated by 2
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This may help: https://twitter.com/shoghicp/status/606573175766401024 This bug is also a duplicate of MCPE-8736
Is your/friend's name contain space or anything except Numbers/Letters or Underscore.