Hi Lee, thanks for your question.

You can utilize dynamic groups to populate the Windows Autopatch Device Registration group, but currently Windows Autopatch doesn't support managing update ring membership using your Azure AD groups. When a device is enrolled into the Windows Autopatch service, the device is assigned to an update ring so that we have the right distributions across your estate. The distribution of each ring is designed to release to as few devices as possible to get the signals needed to make a quality evaluation of a given release.

You can move devices between rings by following the steps shown here: Update management - Windows Deployment | Microsoft Docs

You can find further information in the  Windows Autopatch - Frequently Asked Questions (FAQ) - Windows Deployment | Microsoft Docs