Official vendor documentation (Microsoft Endpoint Manager/Intune Compliance Policies):
Reference: Microsoft Documentation on Device Compliance Policies, Section: "How compliance policy settings work" and "Conflict Resolution."
Content: States that if a device is assigned multiple policies, all policies are evaluated, and the device must comply with all of them. If multiple policies have conflicting settings, the device takes the most restrictive setting. For grace periods, the shortest time (most restrictive) is applied for marking the device as noncompliant if it fails a required setting. A "Not configured" setting does not enforce a requirement.
Official vendor documentation (Microsoft Intune Configuration Service Provider (CSP) Reference):
Reference: Microsoft Windows Client Management documentation, CSP for BitLocker (BitLocker CSP).
Content: Defines the 'Require BitLocker' setting in compliance policies. The 'Not configured' state means the setting is not evaluated as a requirement for compliance by that specific policy.