Write access needed?

I am following an exercise with MS, where I am using a forked repo and needed to trigger a build via azure pipeline, by committing an yml file and creating a pull request for it. Unfortunately GitHub tells me that: This branch has no conflicts with the base branch

Only those with write access to this repository can merge pull requests.
According to the exercise there should not be issues with the access and this message prevents me from going further. Any idea how can I resolve this? Thanks in advance,