Windows Autopilot ESP App Failures: My Troubleshooting Approach

first stop for me is HKLM\SOFTWARE\Microsoft\Windows\Autopilot\EnrollmentStatusTracking. if any Win32App_{id} under the Sidecar tracking key shows InstallationState 4, ESP stops installing there and the IME log tells you why. second is whether the blocking list mixes LOB MSI and Win32. both use TrustedInstaller and you get "Another installation is in progress". i wrote a free read-only script that checks ESP profiles for that mix and for Microsoft 365 Apps in the blocking list, if you want to try it against a test tenant: https://github.com/zakopenc/autopilot-deployment-doctor-beta