From what I’ve been reading, the iOS / tvOS 15 betas still have some issues. There’s a number of active threads discussing this (incl. feedback from Plex)
Related topics
| Topic | Replies | Views | Activity | |
|---|---|---|---|---|
| iOS 15 compatible release | 5 | 419 | November 26, 2021 | |
| Roll back this change ... No more Audio | 9 | 431 | October 9, 2021 | |
| Plex on ipadOS 15 won't play a number of videos, some others play with no sound, some play just fine | 2 | 150 | July 5, 2021 | |
| [BUG] No Audio on Certain File Types with tvOS 15 (beta) and Plex AppleTV (beta) | 31 | 2714 | November 10, 2021 | |
| No audio from Apple TV 4K and iPhone 12 PM (tvOS/iOS 15 beta) | 100 | 5571 | November 20, 2021 |
