Motorola Edge phones lose AR Cast functionality when upgrading from Android 12 to Android 13. If the phone is running Android 13, go into UDC (Lenovo Universal Device Client) and search for updates. The phone should show prompt to install TR Cast after a couple of seconds.
Using the Camera Frame Access feature with ARCast or TRCast is not possible. Unfortunately, there is no workaround available at this moment. The Snapdragon Spaces team is working on a solution to provide video casting on Spaces enabled devices.