Pull from ionic repo

Hi,
so I have this old repo that has the latest commits only in the ionic repo for unknown reasons.
I watched https://ionicframework.com/docs/appflow/quickstart/ionic-remote but I’m still not sure.

I want to connect to the ionic git and pull all changes from there to have a fresh working directory again.
So I tried running locally

git clone git@git.ionicjs.com:bla/bla.git --origin=ionic

but got

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

How do I clone it correctly?