Ssh-keygen on linux without the agent

SSH, OpenPGP, GPG
2

Using openssh with OnlyKey is a different thing then using the agent. If you are using the FIDO2 security key feature of openssh here is a doc for how to do that - OpenSSH | Docs

Since you are using Linux also make sure UDEV rule is set up correctly - Using OnlyKey with Linux | Docs

If you decide to try the agent instead for SSH and GPG usage that guide is here - OnlyKey SSH/GPG agent | Docs

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