Hi,

We found GitHub hook trigger for GITScm polling is not working after SAML 2.0 enabled.
Here's the steps to reproduce it:

  1. Go to configure and make sure Jenkins Security Realm is Jenkins’ own user database.
  2. Open a PR from GitHub and make sure can trigger a Job normally.
  3. Enable SAML 2.0
  4. Open a PR from GitHub
  5. Trigger Job failed, but doesn't receive any error message

Here's the version Info:
  - Jenkins version: 2.289.2
  - SAML plugin: 2.0.8
  - SAML Single Sign On(SSO): 1.0.5 
  - Github plugin: 1.32.0
  - github-api plugin: 1.117
  - github-branch-source plugin: 2.9.3
  - github-pr-comment-build plugin: 2.3
  - pipeline-github-lib plugin: 1.0
Best Regards,

Alex