Had the same issue with clean Windows 10 Ent in domain.

even going via Add/Remove Programs => Turn Windows features on or off, does not enable as keeps complaining of “Add feature fails with error 0x800F0954

Here is the fix:
1. regedit
2. HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU
3. UseWUServer -> 0
4. net stop wuauserv && net start wuauserv from cmd

Then try .net framework 3.5 via Turn Windows features (mentioned above)

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