<!-- Add the related story/sub-task/bug number, like Resolves#123, or
remove if NA -->
**Related issue:** Resolves#33418 (this OS update change is unrelated
to the bigger Windows delete part of the story)
<img width="598" height="438" alt="image"
src="https://github.com/user-attachments/assets/7dca50c6-5ca4-4c54-b57f-c98dda5fb4d1"
/>
# Checklist for submitter
If some of the following don't apply, delete the relevant line.
- [x] Changes file added for user-visible changes in `changes/`,
`orbit/changes/` or `ee/fleetd-chrome/changes`.
## Testing
- [x] QA'd all new/changed functionality manually
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Windows update deadline and grace period settings can now be cleared,
allowing removal of update enforcement policies.
* **Bug Fixes**
* Updated validation logic to properly handle empty deadline and grace
period fields.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Victor Lyuboslavsky
c6538bd434