I’ve had a similar problem with the same OS versions. My Steinberg UR824 was no longer recognized by the Mac. Its software console could see it, and it worked in USB-compliant mode, but couldn’t be used by the OS with its driver.
I can’t know if this also happens with other devices, since my other audio interface (from Universal Audio) doesn’t require a driver, and is simply USB-compliant.
MacOS 12.6.9 lasted just ten days, before being supplanted by 12.7 and making my audio interface appear again. So, I suspected my audio driver issue was due to some bugs in the OS. But then the audio interface disappeared again when upgrading to MacOS 12.7.1, and the Yamaha driver of the UR824 to v3.1.6.
Downgrading the Yamaha audio driver to v3.1.4 made the audio interface appear again. So, I wonder if it is the driver, or a combination of the OS and the driver. I wonder if @Ulf can be interested in this issue. I describe my tribulations here:
Audio interface no longer recognized
@benwiggy asks why the OP doesn’t upgrade to a system after Monterey. I can offer my example: my Mac is no longer supported, at least officially. It’s not an obsolete system: a 12-core 2013 Mac Pro is still a powerful machine, with a full orchestra rendering not taking more than one third of the available CPU time.
And it is compatible with a lot of things with no need of adapters. Plus, running other OSs (older MacOSs, Windows 10) is only possible with an Intel Mac. I’m personally still forced to use these systems, and a new Mac would mean also keeping an older one to run those things.
Monterey will be supported for another year. After that date, security concerns (assuming a third-party antivirus is not considered a viable solution) will become an important consideration, and either one will upgrade to non-supported OSs via OpenCore, or buy a new Mac.
Paolo