Intune Microsoft 365 Apps Not Installing: A Read-First MSI, CDN, and Office CSP Error Triage

Intune Microsoft 365 Apps stuck at install pending, not installing, or Failed? Confirm the Office CSP app type (not Win32), read Troubleshoot + Program Files folders and CDN reachability, decode 1603/17002/1460, then fix MSI/bitness/open apps—before you rebuild the suite or reimage.