Pre-update of the iOS app (80.00.04) my Arc correctly showed up under Sonos Voice Control speakers. After the 80.00.08 update, Arc is missing as a SVC enabled speaker (App says "one or more speakers are offline" when I try to add it). The Arc shows up online normally in my list of connected speakers to control, play music on, etc  

My Beam, Era 100, Move, and Sonos One still correctly displayed on 80.00.04 and 80.00.08.

This is on iPad and iPhone.