Update git remote from github to gitlab

I've updated the git remote from a private repo on github to a private hosted gitlab repo.

Forge is connect to github but i still getting the following error when trying to deploy from the new git remote:

Wed Jan 4 14:37:39 UTC 2017
Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

The new private repo on gitlab is under a organisation (which i'm the owner of), could this be an issue ?