@AtoruXD it’s already being released to normal version of the browser. It’s currently rolling out to 50% of users and will be gradually expanding. If you want to see if your browser has the fix, go to brave://version and look for BTMGoogleAuthWorkaroundRelease:Enabled like you see highlighed in blue on my screenshot below
If it says Default instead of Enabled, then you don’t have it yet but it should eventually come to you. They are doing this as a slower rollout in case any other problems come up.
The reason this happened is because Google changed things around. It was happening in other browsers but more frequent in Brave because of how it stops 3rd party cookies. Brave is doing a bit of a workaround to make this work, but in the meanwhile also is trying to get Chromium and Google to make changes upstream.