Try setting Truecaller as default sms app and do the UPI authentication. Gpay verification always failed when I was using Google Messages cause of the class 0 messages. Try it with truecaller.
I will test it.
---------- Post added at 06:40 PM ---------- Previous post was at 06:30 PM ----------
I tested it and it worked. No more screen blinking and it fixed the google services issue. I was not able sign in before now i can. :D