<!-- Add the related story/sub-task/bug number, like Resolves#123, or
remove if NA -->
**Related issue:** Resolves#49329
## What & why
Fresh **Windows 11 25H2** (build 10.0.26200) devices failed Microsoft
Entra / Autopilot MDM auto-enrollment during OOBE with error
**80180006**. The device advertises an MS-MDE2 discovery
`RequestVersion` of `"9.0"`, and Fleet's `IsValidDiscoveryMsg()`
rejected it via an exact-match allow-list (`{"4.0","5.0","6.0","7.0"}`)
that could only be changed by rebuilding the server.
The discovery **response** already pins the protocol to
`EnrollmentVersionV4` (`"4.0"`) and the client negotiates down, so the
exact-match check was the only blocker. This PR implements the issue's
preferred fix: **accept any `RequestVersion >= 4.0`**, which is
forward-compatible with future Windows version bumps.
- `server/mdm/microsoft/syncml/syncml.go`: replaced the
`SupportedEnrollmentVersions` allow-list var with a
`MinSupportedEnrollmentVersion` constant.
- `server/fleet/microsoft_mdm.go`: added `enrollmentVersionAtLeast`
(numeric component-wise compare, so `"10.0" > "9.0"`) and changed
discovery validation to accept any version at or above the minimum.
# Checklist for submitter
- [x] Changes file added for user-visible changes in `changes/`,
`orbit/changes/` or `ee/fleetd-chrome/changes`.
See [Changes
files](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/guides/committing-changes.md#changes-files)
for more information.
- [x] Input data is properly validated, `SELECT *` is avoided, SQL
injection is prevented (using placeholders for values in statements), JS
inline code is prevented especially for url redirects, and untrusted
data interpolated into shell scripts/commands is validated against shell
metacharacters.
## Testing
- [x] Added/updated automated tests
- [ ] QA'd all new/changed functionality manually
For unreleased bug fixes in a release candidate, one of:
- [x] Confirmed that the fix is not expected to adversely impact load
test results
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Bug Fixes**
* Fixed MDM enrollment failures on fresh Windows 11 25H2 and other
recent builds.
* Discovery requests now accept supported MDE2 `RequestVersion` values
at or above the minimum supported version (instead of requiring an exact
match).
* Invalid or outdated discovery versions now return more specific
validation errors.
* **Tests**
* Added unit test coverage for minimum, equal, newer, and invalid
enrollment version comparisons.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
