Hi, @ejfasf. I can see when this repository and site were linked. This repo was linked on Mon, 07 Jan 2019 13:46:58 UTC +00:00. Seeing as that is four months prior to this topic being created, my best guess is that this site does need to have the repository relinked to resolve this.
When this site was linked on 2019-01-07, the GitHub app was not detected by the GitHub user that linked the site and repo at Netlify. I say “GitHub user” because our web app requires you to login to GitHub so we can make the API call to get the GitHub Netlify app installation id number.
Would you please test relinking this site and repo again now that we are sure the GitHub app is installed?
The relinking instructions can be found here, quoting:
To change which repository is linked to your site, go to Site settings > Build & deploy > Continuous deployment > Build settings , select Edit settings , then Link to a different repository .
Just select the same repository as the final step to “relink” the existing repository. If this doesn’t resolve the issue, please let us know.