Hi
@Christine_ASUS ,
thank you for the instructions, I did following steps:
I downgraded to Android 9, did full reset and tested Google Pay - it was working OK, Google Store said that Device is certified. Therefore the issue is not with my particular device/hardware
Right after that I upgraded to Android 10 build 429 and the issue reproduced - Google Store said that 'Device is NOT certified' and Google Pay did not add the card for in store payment.
Right after that I created bug report that I sent you in private message.
Please let me know if you need any other info / tests / logs from my side to proceed with fixing this bug.
Thank you in advance for your help