@PanTran_nsfw @Herbubulle21 Thanks for the additional information about this bug - we do have a bug report for it here, perhaps you'd like to add a vote and any new information to it:
https://bugs.mojang.com/browse/MCPE-155777
@GaryTheGhoul Hi there Gary! Sorry to hear that. Our support team would be the best place to see if they can help. Some users have found that a complete reinstall of the game can help to link accounts correctly, but please make sure you have any worlds you want to keep backed up first!