How to verify UPI account which is failed due to Class 0 message?

Simply use android splits screen while verification... Class 0 msg will be shown in another screen so it verification will be done without any problem.. I do this everytime after changing rom.. 

u can activate split screen by going to recent app screen then press and hold on messaging icon on top, press on split, thanks me later.

Another Solution is to temporary Change Network mode to 2G only till Your Verification Completes...