Had a Pixel 2 XL and it worked awesomely with my Sena 20s. Pressing the rear button on the Sena while riding would launch the Google Assistant. I upgraded to the Pixel 4 XL using Android 10 and suddenly, no response from my phone when I would press the rear button on my Sena. Searched months for a solution. Finally found the fix for me was to turn off the Adaptive Battery setting on the Pixel 4 XL. Rode several hours today and was finally able to interact with Google Assistant. Hope this helps someone else out.
Sena 20s and Pixel 4 XL Android 10