I’m not sure if this is it but something to check:
Go to brave://settings/content/notifications
and see if the website(s) you want to receive notifications from are showing in:
“Allowed to send notifications”
If not, click the “ADD” button to the right of “Allowed to send notifications” and enter the websites you want to receive notifications from…
Then to confirm it’s properly set, go to one of the websites you’ve added to that list, then click the little “switch” to the left of the address bar/https:// and see if “Notifications” is turned on there. Such as in this screenshot:
OR you can go the opposite way, go to that ‘switch’ icon menu on the website (as also seen in screenshot above) you want notifications from, CHOOSE “Site Settings” at the bottom and then go down to “Notifications” and choose “Allow”