Your customer is reporting that some users can enable Bluetooth, despite having set a company-wide policy that should disable Bluetooth. Referring to the User Manager developers' documentation, in which version of Android was support for disabling Bluetooth introduced?

Android 8.0 (Oreo) introduced the DISALLOWBLUETOOTH user restriction, allowing administrators to disable Bluetooth functionality for users. This policy is crucial for enforcing security and compliance in enterprise environments where Bluetooth connectivity might pose risks. Earlier versions of Android, such as 6.0, 7.0, and even 9.0, did not introduce this specific restriction. While Android 9.0 (Pie) brought other security enhancements, the ability to disable Bluetooth via a user restriction was a feature of Android 8.0.