SSH is asking for a password
If you got your HPC account through the new HPC portal (https://portal.hpc.fau.de) because it is for example an NHR project, there is NO password for such an HPC account. You log into the HPC portal using your SSO credentials (of your university). Access to the HPC systems with your HPC account created through the portal is by SSH keys only. The SSH public key is uploaded to the HPC portal and it will take a couple of hours until all HPC systems know a new/changed SSH public key. Multiple SSH public keys can be uploaded.