Hm, yeah. Just checked in macOS, and it is using AAC there. So lack of AAC on my Linux device would mean it is not available here for some reason then I guess, and not an issue with the headset?
I can’t seem find a way to check the same on Windows 10 without using a third-party tool, and since this is a work computer, that is not an option for me. My guess is then that it uses SDC. Seems like AAC is supported natively in Windows 11 though, and the device is scheduled for a Win 11 install soon. Hopefully that will resolve the issue for me during work hours.
For now it seems to work better under Linux with LDAC though, which is my main use case. I swear I’ve had issues with this before, but I just streamed an entire album of high-bitrate FLAC tracks without issue now. Hopefully it stays this way.