Build from forked pr do not run until a commit from project owner is added to pr

With the advanced options “only build pull requests” and “build forked PR’s” enabled builds are not being triggered. Other relevant information this is on a private repo in an organization and the PR’s are from user’s who do not have write permission on the repo. If a merge from master is added to the pr the build will run. Also, it will run if a commit by a user with write permissions is added.

Is there a way to manually trigger the build or triage why there is no build event?