@Pernille_Hansen When you migrate to the Atlassian if you don't use the same email address throughout the whole process, it'll create a new Atlassian account, however you should still be able to access your Trello account using your old email address.
Hello Community! My name is Brittany Joiner and I am a Trello enthusiast and Atlassian Community Leader. I'll be sharing with you a series of videos with my top tips on how to best use Trello...
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