I can’t answer to your troubles with it not coming on, but while the Samsung chargers show it’s charging, they do not in fact actually charge the device to my disappointment, and probably many others that are switching from Samsung. Best guess is that the Qi chips are requiring something specific found in the Google Pixel Stand and without it, it doesn’t charge correctly. I tried my Samsung Wireless Charger with the same indication of charging that you got but the device was still losing power so I just set up the Pixel stand for charging. I would recommend, if you haven’t yet, just leave it plugged in for an hour and see if you can get it to turn on, if not, take it back to the store you got it from and replace it.