It depends on the EMM and what they're using for the DPC. If you're using an AMAPI aligned EMM then my understanding is that the EMM is basically just a console and Google is doing the actual management of the device. In that scenario you would need the devices connected to a public internet connection, or at least with access to all of the Google services. With Custom DPC EMMs you can do many things offline and I have been successfully doing so for years. With fully managed devices, which I'm assume yours are based off the "offline" status, I typically do everything in my power to NOT rely on anything from Google services. They're unpredictable, unreliable, and don't offer admins much visibility or control. I may be a dissenting opinion here on the Android Enterprise forum, but thats my perspective shaped from years of experience deploying these devices.
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