Gizmodo article say you can only connect them to 1 device. if you connected them and then reset your phone, or tried to connect to a different device, you will need to use the reset button in the case. I don't have them, I am just telling you what the article said. Good luck. I actually cancelled my order. I wanted better sound than what the Pixel Buds provide. I picked up the Bowers and Wilkins PX wireless headphones. No google assistant or translate, but man do they sound incredible. If I ever get to Europe I will probably pick up a pair of Pixel Buds, just for the translate feature.
UPDATE: Although nowhere in the documentation for the B&W PX headphones, assistant does work, you just need to long press the pause button. So Yay!