Github authentication keys help

[Berkyjay]

I'm trying to clone a personal github repo to my Truenas Core (TrueNAS-13.0-U2) box so I can do some dev work on it. But I am getting a permissions error

Code:

git@github.com: Permission denied (publickey).
fatal: Could not read from remote repository.
Please make sure you have the correct access rights

I generated a ssh keypair on my box and added it to my github accounts ssh keys list. I thought it was a pretty straight forward process, so I'm not sure what I'm missing here. Could someone help me sort this out?