I'm trying to add an SSH key to my new bitbucket account. However, when I paste it, I get an error message: "Someone has already added that SSH key."
Then I remembered it could be my old account. So I login there, remove the key, try again, but get the same error message again. I wait a couple hours, maybe it needs to be cleared from some internal cache or something like that, try again, still get the same error message.
How do I resolve this?