Can't add ssh because it was already added
1 answer
Welcome to the Atlassian Community!
There's no easy way to work this out because the keys that belong to other accounts should not be shared.
If you shared the key with someone or used it with a different account, you should already know who it is. If someone gave you the key, you would need to ask them.
If you have no luck chasing it down, you can raise a support request with Atlassian, and they can search out the key for you and identify the account you shared it with.
If you don't want to spend ages chasing down the share, you can (and should) create a new key for your account and use that instead.
For a better explanation, see Theodora’s answer on 
Problem adding SSH key: "Someone has already added that key as an access key to a repository."
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