Has anyone had any success with this combo? I tried a couple of months ago and got nowhere, I honestly doubt it works.

There are some people claiming to have gotten it to work with either a externally powered USB hub and/or an extension cord (due to a theory that there is radio interference between the yellow and coral). I have not managed to come in contact with any of them, and the ones I have made contact with have rebutted the claim.

The M2 is a no go, I know that much but this is in regards to the USB version. "Home assistant"/Nabu Casa themselves have stated that it works (or should work) on at least two occasions (https://www.crowdsupply.com/nabu-casa/home-assistant-yellow/updates/thank-you-video-demo-and-google-coral , "However, if you still want to use the Coral accelerator, Home Assistant Yellow is compatible with the Coral USB accelerator stick, which requires a USB-C to USB Type A cable.")