You wanted to link a git repo with Domino and created an SSH key pair on your computer and put the public key on github. When you went to put your private key into your Git Credentials in Domino you get an error when you try to put in the ssh key.
If the domain and passphrase are correct then it could be the format of that key. It is possible that your key isn't one of the following types - RSA, DSA, or ECDSA (i.e. it's an OPENSSH type) You should see something like "-----BEGIN RSA PRIVATE KEY-----" at the beginning of it if it's RSA. One way to convert the private key is
ssh-keygen -p -m PEM -f ~/.ssh/id_rsa, which leaves your public key the same so you don’t have to update other services that use it.