Working with your Git repo over SSH is convenient and secure. Here's the trick to using SSH with multiple GitLab.com accounts.
Here’s the situation: The easiest and most secure way to interact with Git repos hosted on GitLab is over the SSH protocol. While most people only use one GitLab.com account, a freelancer or consultant might need to work with repos from multiple accounts. If that freelancer attempts to upload their public SSH key to multiple accounts, they’ll get the following error message from GitLab: Fingerprint has already been taken.