Problem

When attempting to add a new SSH key in Bitbucket Cloud, you receive this error

Someone has already registered that SSH key.

Cause

The SSH key you have chosen has likely been registered by you at some point in the past or by a colleague on a team account.

Resolution

• Open a terminal with SSH configured for Bitbucket Cloud and enter the following

ssh -T git@bitbucket.org

• Look in the output for the username of the account that has the SSH key registered.

$ ssh -T git@bitbucket.org
conq: logged in as mbertrand80.
You can use git or hg to connect to Bitbucket. Shell access is disabled.

• Then visit the account for that username and remove or update the SSH key configuration.