@Halogeen Thanks for posting in our Q&A.
To clarify this issue, did you deploy the Windows 10 feature updates policy? As I know, we need to use Windows 10 update rings policy and the Windows 10 feature updates policy together.
And the setting "Feature update deferral period (days)" must be set to 0.
https://learn.microsoft.com/en-us/mem/intune/protect/windows-10-feature-updates#limitations-for-windows-10-feature-updates-policy
It is suggested to try and check if it works.
If there is anything update, feel free to let us know.
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