I have been contributing to a project for year, literally years. All of a sudden about 3 months ago, I can click the Edit button on the target repo. I was always able to do so and as part of my modification create a PR online directly.
I have been ion talks with the repo owner and we tried everything we could see in the settings, still I can't edit files not create a PR from a fork. I'm defined with write access in the repo and other users that are not even defined can edit the file and send PR. So we are all puzzled on what the root cause is here.
Is there a list of troubleshooting steps I can go through to try to fix this?

Thanks