"Git fetch jumpstart" issue when setting up Jumpstart

Hi,
I'm following the 3 steps to setup Jumpstart after buying my licence:

But when I'm trying to merge jumpstart I get this error, even if my Github account has access to the jumpstart pro repository :(

Is there something I'm missing?

Did you accept the GitHub invitation?

Yes I did, I have access to jumpstart-pro. Maybe I duplicated it wrong 

Okay good! Do you have your SSH key added to your Github account? It says permission denied, so I assume your SSH keys or credentials aren't valid.

https://docs.github.com/en/github/authenticating-to-github/connecting-to-github-with-ssh/testing-your-ssh-connection

1. Get your public SSH key by typing `cat ~/.ssh/id_rsa.pub` into your terminal
2. Copy the key, including the `ssh-rsa` *but excluding your computer name at the end*
3. Go to https://github.com/settings/ssh
4. Add your SSH key

^this worked for me