Hello Dogukan Ucer,
Error 12001 means one of the mandatory fields is empty or misconfigured in the OEM profile. Please confirm all settings are properly configured in the OEM profile and no overlapping profiles.
For further troubleshooting, refer to: https://learn.microsoft.com/en-us/intune/intune-service/user-help/samsung-knox-errors-android
Hope this helps!
If you found the information above helpful, please Click Yes. This will assist others in the community who encounter a similar issue, enabling them to quickly find the solution and benefit from the guidance provided.