I have a Backoffice controller extending UmbracoApiController and some of actions are with UmbracoAuthorize attribute. All works fine unless the browser contains both Member and Backend user authentication cookies. Everytime there is a get or post request to these UmbracoAuthorize actions, it returns 401 and redirected to Backoffice login page. This is the cookie -

1. cookie __RequestVerificationToken={verificationtoken}; UMB_UPDCHK=1; .ASPXAUTH={member token}; UMB_UCONTEXT={user token}