Issue Summary

This is reproducible on Data Center: yes

First time user (without a cookie/session) cannot log in on CP 'Log in' page.

This cannot be reproduced in 5.12.x LTS.

Steps to Reproduce

1. Open a new Incognito wnidow
2. Go to customer portal login URL: /servicedesk/customer/user/login
3. Type in correct login credentials (e.g. `admin/password`) into the login form
4. Click 'Log in' button

Expected Results

User should be logged into either portal land page or the help-center page in customer portal.

Actual Results

An error flag pops up saying 'Something went wrong'.
POST XHR request failed with HTTP 412.

Workaround

Refresh the page and then try to log in again.