Add googleadservices.com in the allowed URL, it should work.
![Pavithran_0-1665686622013.png Pavithran_0-1665686622013.png](https://community.meraki.com/t5/image/serverpage/image-id/25967iE0B8E67D1F392230/image-size/medium?v=v2&px=400)
Its showing me that googleadservices doesn't belong to any category.
Also I have checked in bright cloud, its showing me the same. Its in parked domains.
![Pavithran_1-1665686650087.png Pavithran_1-1665686650087.png](https://community.meraki.com/t5/image/serverpage/image-id/25968i9328B61FF9D0DCA6/image-dimensions/294x208?v=v2)
If its again blocked, then we have to check IPS/IDS or other security events.