Git cli pull request - no PR created in the remote repo

After creating a git pull request by CLI, it is not visible in the remote repo. Should I use another push request to update the remote (Gitea) repo?

Context is a Tekton pipeline. I have to work with the command line interface or a Tekton task. The existing PR Tekton task is for GitHub or Gitlab.I work here with a Gitea repo.

First I create a branch 'prod' from the 'master' branch, edit a change, commit the change and push it to the remote repo. Works of course fine.

Then I start a pull request like this:

git request-pull master http://remote-repo.git prod

For more info see this official doc.

In the remote repo the new pull request is not visible. How come?

Do I have to push any branch to the remote repo?

I tried to use origin/master as a parameter, but that is an invalid 'revision'.