I've been using Brave on Android for Months, Get Ads Notifications, No BAT Ever

Hi @lin.david.y, what about estimated pending BAT, have you never seen a BAT amount there?
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Make sure Brave ads are supported in your region (use ‘Find’ to quickly find your country):

If your region is supported, it’s the use of a VPN that is likely the issue.

EDIT: Here are some threads I’ve come across discussing the use of VPNs. When you’ve time, you could look through them and see if this may be the cause of your issue.