Hello @Dan McDermott
The reason Windows Update is trying to push 25H2 even though you’re already on 26H2 comes down Cache files that may have been stored on the device.
The way to stop that is by resetting the update components so Windows doesn’t keep retrying the wrong feature update Open Command Prompt (Admin) Windows + X and search for Command Prompt and select Run as admin.
Run these one by one:
cmd
:: 1. Stop update services
net stop wuauserv
net stop bits
net stop cryptsvc
:: 2. Rename update cache folders
ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
ren C:\Windows\System32\catroot2 catroot2.old
:: 3. Create a system restore point
wmic.exe shadowcopy call create Volume='C:\'
:: 4. Restart services
net start wuauserv
net start bits
net start cryptsvc
After this reset, check Windows Update again Or restart the device.
Hope this helps.