As first spotted by Windows Latest, Microsoft confirmed the reports, and it found that the issue goes back to KB5064081 ...
Microsoft confirms September Patch Tuesday update KB5065426 and August's KB5064081 triggers DRM playback issues on Windows 11 ...
Windows 11 update KB5065426 won't install for some users due to error codes 0x800F0991, 0x800F0922, 0x80071A2D, 0x800F081F, ...
Windows 11 September KB5065426 update is not installing with multiple error codes, leaving some September 2025 updates stuck.
Windows 11 KB5065426 won't install due to several errors, such as 0x800F0991, 0x800F0922, 0x80071A2D, 0x800F081F, and more.
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