Git ERROR: You are not allowed to push code to this project.

I have this new project which I’ve set up locally.

However, when I was pushing the initial code to the project, I got this error:

$ git push --set-upstream origin main --verbose
Pushing to gitlab.com:learning-repositories-x/godot/dodge-the-creeps.git
remote: 
remote: ========================================================================
remote: 
remote: ERROR: You are not allowed to push code to this project.

remote: 
remote: ========================================================================
remote: 
fatal: Could not read from remote repository.

I checked git log and confirmed that the commit is made by my Personal Gitlab account.

I also checked my ~/.ssh/config , which shows:

Host gitlab.com
  Hostname gitlab.com
  PreferredAuthentications publickey
  IdentityFile ~/.ssh/path-to-key
Host <some-work-username>.gitlab.com
  Hostname gitlab.com
  PreferredAuthentications publickey
  IdentityFile ~/.ssh/path-to-key-2

Debugging via ssh -v git@gitlab.com, I saw that it connected to Gitlab via my work account, AND that it tried several other SSH keys I have (le gasp!!!).

This StackOverflow answer pointed me to the right direction:

https://stackoverflow.com/questions/4565700/how-to-specify-the-private-ssh-key-to-use-when-executing-shell-command-on-git#:~:text=prevent%20the%20SSH

Basically, I needed to add IdentitiesOnly yes to get it to only use the defined IdentityFile.