This can be resolved by re-enabling the device in Network Device Browser several times, changing the AVB configuration several times, or rebooting the Mac.
Pro Tools | Carbon is supported with Pro Tools 2021.6 or higher on M1 Macs running macOS 11.3 & 11.4, however users may experience the following known issues: Pro Tools 2021.6 & 2021.7 software, included Avid plugins, and Avid control surfaces are all compatible with macOS 11.4 and later on M1 Macs via Rosetta 2. ⚠️ Pro Tools compatibility on Apple silicon/M1 computers ⚠️