As per the rsso.log, Admin user login happens successfully in the UI.
It fails during the next call for /auth-info as one may see in the network log.
It fails because csrf-rsso-admin-token value is empty in the /auth-info call. For some reason, the browser cuts it off.
[TID:SAAS_TENANT][80-exec-15] WARN .s.rest.filters.FilterHelper.getAdminCookieValue(): The 'CSRF-RSSO-ADMIN-TOKEN' header is missing
To resolve the issue, please involve the system administrator to clarify why the header is not being sent. It is possible that some local system policies on end-user VM cuts off unknown headers