Fingerprint has already been taken Gitlab

I deleted my local Gitlab repository (using Ubuntu) and recreated it. Now I wanted to add a new SSH key so I don't have to type email/pw on every push. What I did:

ssh-keygen -t rsa -b 4096 -C ""
ssh-add ~/.ssh/id_rsa

Then added the content of id_rsa.pub into the key form on Gitlab/SSH Keys. I deleted every old key in the settings and also every key in ~/.ssh/ before. And i still get the messages:

Fingerprint has already been taken / Fingerprint cannot be generated

Sorted by: Reset to default

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