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Yes, the issue has persisted across updates to the latest public betas of macOS 27. The VM operating system does not seem to matter, as I have noticed the same problem across Windows 11 and various Linux distros.Same problem here with macOS 27 (latest Beta) and Parallels 27 - AirPods and 3rd party Headphones no longer working having any sound in Win11 Pro. Working fine with MacBook speakers as well as speakers connected through headphone jack.
I just tried your workaround in a Windows guest VM, and dropping to 16-bit audio output fixes the sound coming through the Bluetooth headphones. Good catch!Quick follow-up after further testing: you can set it to 16 bit, 88200 Hz.
The bit depth doesn't affect the fix — only the 88.2 kHz sample rate is required. Switching to 16-bit reduces system load and bandwidth usage, which helps prevent audio stutters or drops!
I've submitted a ticket to Parallels support regarding the issue. I requested a fix and provided them with our workaround in the meantime.I just tried your workaround in a Windows guest VM, and dropping to 16-bit audio output fixes the sound coming through the Bluetooth headphones. Good catch!
That said, I still think there needs to be a bug request for the Parallels team to resolve the issue across the board with all guest operating systems. Things like audio should just work out of the box without having to go into each OS and fiddle with audio settings for sound over Bluetooth headphones. It just worked fine prior to this version, so the user experience should be consistent for a newer release of macOS and Parallels.