If I run under git bash (windows 10):
$ git clone --recursive firstname.lastname@example.org:openframeworks/openFrameworks.git
Cloning into ‘openFrameworks’…
The authenticity of host ‘github com (126.96.36.199)’ can’t be established.
RSA key fingerprint is SHA256:nThbg6kXUpJWGl7E1IGOCspRomTxdCARLviKw6E5SY8.
Are you sure you want to continue connecting (yes/no/[fingerprint])?
I say yes:
email@example.com: Permission denied (publickey).
fatal: Could not read from remote repository.
Please make sure you have the correct access rights
and the repository exists.