I ran into the same issue as this person (the ticket was not resolved): https://gitlab.com/gitlab-com/support-forum/issues/2631
I am trying to load a new SSH key to my user on Gitlab EEP and the server responds with this message:
Key is invalid
Key type is forbidden. Must be RSA, DSA, ECDSA, or ED25519
Fingerprint cannot be generated"
Steps to reproduce:
- Download Puttygen (latest version, 64 bit on Windows 10)
- Select the menu option “Key → SSH-2 RSA Key”
- Change the “number of bits in a generated key” from 2048 to 4096
- Click on generate
- Save the public key and private key