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"The specified SSH key is already in use on this service." hit me a few hours ago when trying to push to create a new repository to a group in GitLab.
The issue turned out to be a repository with the same name (camel case but same characters). The error message is very ambigious and only starts to somewhat make sense after noticing the underlying issue.
Couldn't find any matches when googling so maybe this is why you ended up on here and I could save you some time.