Why are my Admob video ads are not playing?

I have integrated Admob in my android game for Ads, my game is live in India only. I am not getting video ads in my game.(Both Interstitial and Rewarded)

When I implemented Ads for the first time, videos did worked(used my Live ID for admob, which is not recommended) but now my videos aren’t working at all.Now I am using test ID’s but still I am not receiving any video ads, normal interstitial ads (image, Rich text) are working fine, same with live ID.

Is there any setting which I had triggered unknowingly?
Where should I start digging?

Note: It’s a Blueprint only project.

how did you use the image ads i can do only banners to work