Fingerprint has already been taken

Hí I was trying to add a ssh key but Gitlab frontend said me: "Fingerprint has already been taken"

I have two account: israelbuitron (currently used) and israel.buitron (unused).
This key was removed from israel.buitron account.
I tried to add my key into israelbuitron.

How can I add my key?

Here you have a screenshot:

Maybe the key from your other account was not properly removed, I imagine GitLab not allowing the same key to multiple accounts. Try generating a new key and see if that resolves the problem. If however, you do not want multiple keys (locally) and this (possible) solution does not satisfy you I would try to contact GitLab support.