@Anudhyan That’s not unusual. We aren’t guaranteed to see ads daily nor are we guaranteed to see the “maximum per hour” that we select.
As CerealLover mentioned in the comment above mine, you can check to see what ads are available in your region by checking https://sampson.codes/brave/ads/my_region/
Beyond that, try to check out a comment I made elsewhere at Unusual activity in active campaigns in my region - #2 by Saoiray and the comment below it once you navigate there.
Also you can be sure to check out FAQ at PSA: User FAQ - Support & Answers