After attempting to link my Xbox account to my Battle.net account, I am now unable to log into the Battle.net launcher. The issue appears during the login process, where the browser redirects to a broken URL.

This fails to complete the login, as localhost:0 is not a valid redirect URI. The launcher hangs in a state where it cannot proceed, and the user remains logged out.

Tested on two different Windows PCs and a Mac – exact same issue on all platforms.

Logged in successfully via browser; credentials accepted every time.

But always redirected to localhost:0, which is unreachable and prevents OAuth completion.

Unlinked Xbox account, reinstalled the Battle.net launcher completely.

Cleared cache, changed language, cleared cookies, tried incognito mode, switched networks, and used different browsers.

Other users are reporting the same issue on Blizzard forums as of 21/06/25, suggesting a wider regression or newly introduced bug.