Can you try using VPN. The free ones will be just fine. I helped out someone when he wasn’t getting Brave rewards. Seems like one possibility that people don’t get rewards is related to their IP address, but I’m not 100% sure. Just use a free VPN, choose a region supported by Brave, wait a few minutes and see if you get a Brave ad. Then after that, turn VPN off and see if you start getting ads normally without VPN.