Your EMM, who uses a Custom DPC, doesn't have a settings toggle that you notice has been available since 7.0 as per the developer documentation. What is the best next step to get access to that feature?

The correct answer is to raise a feature request with your EMM. A Custom DPC (Device Policy Controller) is developed and maintained by the EMM. If a feature available in Android since 7.0 is missing from their DPC's settings, it means the EMM has not yet implemented or exposed that functionality. Therefore, requesting it from them is the direct path to getting it supported. Speaking to your OEM is incorrect because the DPC is an EMM component, not an OEM component. OEMConfig applications manage OEM-specific device features, not core Android Enterprise DPC functionalities. Raising the request with Google is incorrect because Google provides the Android Enterprise APIs, but it's the EMM's responsibility to integrate and expose them in their DPC. Creating a small app yourself is incorrect because DPC functionalities are managed by the EMM's DPC, not by third-party apps via app config.