An update 1/28/25 [Spoiler; it's still broken].
Just returned from being out of town for a few days (car was at home), and I tried to get the audio going. Everything is the same as before -- no audio. Tried resets but to no avail. Rivian did respond to my ticket requesting that I call them...
Installed the 2024.51 update without issue, but now the vehicle has no sound. Nothing from the entertainment unit, no sounds from turning indicators or hazards, no outside lock confirmation chirp. Have tried multiple hard and soft resets.
Posting in the hopes that others who are experiencing...
I have no sound — exactly as you described. Nothing from any speakers, so sound from turn signals, rear cross-traffic alert (when reversing), no sound from exterior lock chime. Tried soft reset then hard reset then soft reset.
Submitted a ticket and booked first available mobile service...