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cookie_invalid

Returned as
The problem's code
HTTP status
400 Bad Request
type
https://zautha.com/docs/errors/cookie_invalid

The Cookie header has a cookie whose name is malformed, uses a __Host- or __Secure- prefix with the wrong letter case, or repeats an earlier cookie’s name in another letter case. Such cookies can be planted by another site to confuse the server, so the request is refused.

Clear the site’s cookies for the instance’s host in the browser and sign in again.