I work with the latest version of Brave (v1.89.137), but I have this problem since the end of january.
I updatet the password for my mail account (web.de). In nearly every Browser on different PCs and in apps on the smartphone I could change the password end everything is fine.
On this PC at work comes always somekind of autologin funktion on web.de. I can only type my mailadress, then I have to verify that I’m human with a captcha, then I get an error screen.
I don’t use the internal passwordmanager, I deleted cookies and settings, I tried with and without synchronization to my Laptop (were the login works fine) and I uninstalled the browser and deleted everything I could find.
After a restart and new installation without importing data it still doesn’t work.
“this PC at work” ← you wrote. A company network’s policy management control, could effectively inspect request headers and:
strip out something, leaving a less-than-worthy packet to continue - leading to → 400 Bad Request
stop passage of packet(s), leading to a back-and-forth of browser and website struggling … to a point of failure → 429 Too Many Requests
Visited your website: ‘https://web.de’ and what I discovered: In my Brave Browser Developer Tools > Network window, I am getting 2 Request failures indicated within headers:
400 Bad Request
429 Too Many Requests
Request URL: https://oauth2.web.de/token Request Method: POST Status Code: 400 Bad Request Remote Address; 217.72.199.25:443
Request URL: https://trace-proxy.mam.dev/swat/api/27/envelope/?sentry_key=be46e3ca3b812b6704cb4829e39e6ff9&sentry_version=7&sentry_client=sentry.javascript.browser%2F7.103.0 Request Method: POST Status Code: 429 Too Many Requests Remote Address: 217.72.199.51:443
Failures, despite setting Brave Site-Specific Shields DOWN ← the big switch.
Hopefully, Brave team member @fanboynz might drop by with a fix (and much better than my attempt at understanding some details).