Here’s why hasn’t it been fixed yet. Sometimes there is more than one cause. Sometimes the cause is difficult to identify until information has been collected from a number of users.
There are VERY few Brave staff and THOUSANDS of users requesting help (plus hundreds more just complaining and whining, taking up valuable staff time), so please be patient. The Brave Rewards program is NOT the main purpose of the Brave browser, so dedicating a lot of staff to Brave Rewards is not feasible. The staff focus their efforts on finding and fixing errors in the program that cause the issues, which takes time. Fixing individual accounts is not their focus.