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Welcome to the Atlassian Community!
As it was stated on your account management pages, Atlassian is the owner and service provider of Trello. It has been for 5 years. Trello uses Atlassian accounts as the user directory by default.
What do you mean by "give me Trello back"?
Yes, but the question was "Who is Atlassian".
Yes, the body of the question mentions lost passwords, but it also asks who Atlassian is again, tells us they have used Trello, they got an email from Atlassian, and that they "want their Trello back". That all probably needs more information before we can say what is happening.
The password thing is actually the least important part of this question, as it's a trivial standard answer - reset the password on the Atlassian account you are trying to use with Trello if you've lost/never set one up/forgotten it.