Using Brave on multiple devices, ads not working on one of them

I am using Brave on all my devices. I use 2 laptops at home for myself, brave rewards are set up on both of them and is working well. I use Brave at my work laptop as well, Brave rewards are set up as well, but I don’t have any ads coming up despite being set up to show 5 ads per hour. I am thinking what am I doing wrong here, but no idea yet.