<!-- Add the related story/sub-task/bug number, like Resolves#123, or
remove if NA -->
**Related issue:** Resolves#49756
# 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.
## Testing
- [x] Added/updated automated tests
- [x] QA'd all new/changed functionality manually
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
## Summary by CodeRabbit
* **Bug Fixes**
* Custom SCEP proxy challenges can again include characters such as
underscores.
* Apple device enrollment works again with these challenges.
* Removed the overly strict printable-character validation from the
Custom SCEP configuration form.
* The Challenge field now only enforces the required-value rule and no
longer shows printable-character validation errors.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Victor Lyuboslavsky
95b535a622