DISM error 0x800f0915 “Repair content could not be found,” even using /Source and /LimitAccess

Deployment Image Servicing and Management tool
Version: 10.0.26100.9549

Image Version: 10.0.26300.9818

[==========================100.0%==========================]
Error: 0x800f0915

The repair content could not be found anywhere.

This is the error message I receive after trying any of the following:

1. DISM /Online /Cleanup-image /RestoreHealth
2. DISM /Online /Cleanup-image /RestoreHealth /Source:WindowsUpdate
   (after confirming I have stable internet access)
3. DISM /Online /Cleanup-image /RestoreHealth /Source:WIM:D:sourcesinstall.wim:1 /LimitAccess
   (after downloading the correct ISO, mounting it, and confirming the correct path and install index)
4. DISM /Online /Cleanup-image /StartComponentCleanup && DISM /Online /Cleanup-image /RestoreHealth
5. SFC /Scannow && shutdown /r then DISM /Online /Cleanup-image /RestoreHealth

I don’t understand how I am still getting a “source” error, even after performing the methods that are supposed to solve source errors. What else can I do here?