I cannot log on to USAA with Brave. Works on Chrome. Windows 64, Brave 1.4.96. I can get to the log on page and input my info but it goes to SYSTEM ERROR then jumps to Log Off Successful.
Have you tired logging into the USAA with all cookies allowed enabled in the Shields panel? Go to the USAA site, change to all cookies allowed, refresh and try to log in again.
Before your recommendation I had lowered the shields on Brave browser but that did not fix it.
With your suggestion, I cleared the cookies, and unblocked a few things. Not sure which (cookies or unblocking) fixed it but it was not lowering the shields.