Adobe Acrobat Edge Extension (v25.9.2.0) does not support rendering or decrypting PDFs protected by Microsoft Purview Information Protection (MPIP). This technology is the core component of sensitivity label encryption. When the extension is enabled and set as the default PDF handler in Edge, it overrides Edge’s native PDF viewer, which DOES support MPIP. The resulting behavior is a failure to load MPIP-protected content until the extension is effectively disabled.