If GitHub pull request checks aren’t running, it may be due to workflow permissions, branch protection rules, or incorrect setup within your GitHub Actions workflow file. Start by reviewing the workflow file to confirm it’s set to trigger on `pull_request` events, which is necessary for pull request-specific actions. Next, navigate to *Settings > Actions > General* in your repository and ensure workflows are permitted to run. Additionally, check branch protection rules for the target branch in *Settings > Branches*, ensuring checks like `Require status checks to pass before merging` are properly configured. Sometimes, workflow permissions may be set to `Read` only, limiting GitHub Actions from updating check statuses. Changing permissions to `Read and Write` in your Actions settings may resolve this. If everything is correctly configured, try re-running the workflow or creating a new pull request to test the setup.