Chosen Solution

So I just bought a headphone adapter from eBay for my pixel 2. When I plug the headphone adapter in it comes up with a notification saying this is not compatible with this phone. Can I make it work or won’t it work at all?

You can try this as it seems to have worked for some people on another forum with the same issue. Insert dongle/adapter into phone with no external speakers in the adapterRestart phonePlug headphones into dongle/adapterStart Google Play Music [and, presumably, play something]