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I do not see a product option in my 2016 WSUS server (to specify the products for which you want to synchronize updates) for the Windows 2025 server. No option for Windows Server Operating System 26100.
Will it work on a Windows 2012 R2 WSUS server
In WSUS:
Server 2025 - Select "Microsoft Server operating system-24H2"
How do you find out what is needed?
https://www.ajtek.ca/blog/why-kb-xxxxxxx-isnt-showing-up-in-wsus/
And a screenshot of the latest April CU for 2025