Describing a login loop clearly and safely

List the screen you start on, the sign-in action, and the screen that returns. Include approximate local time, app or browser version, and whether another device behaves differently.

Do not share credentials, codes, reset links, cookies, or full account identifiers. Try a private browser session only if it is safe and note the result. A precise sequence helps distinguish a redirect loop from a rejected login.

Which two screens keep repeating?