Hi
As suggested I have switched on “transitional” Mode. now you can access non-AMP site directly and AMP sites using /?amp=1.
I am getting Ads on non-AMP site but NO ads on AMP site. I am testing from Desktop in full screen Mode.
Actual Mobile testing is going to non-AMP mode and showing ADS. (even though in advance setting I have selected “Redirect mobile visitors to AMP”