Support Live Preview for a site behind authentication

[sukamat]

Expected Behaviour

User should be able to use the "Live Preview" feature in the DA editor when a site is behind authentication for aem.live URLs.

Actual Behaviour

Clicking the Live Preview option shows an authentication error

Reproduce Scenario (including but not limited to)

Auth on live URLs has been enabled in the Helix Config here:
https://da.live/sheet#/adobecom/da-bacom-graybox/.helix/config

Steps to Reproduce

1. Visit the below page and click Live Preview option
   https://da.live/edit#/adobecom/da-bacom-graybox/test-exp/customer-success-stories
   Alternatively, you can create a new page here and try the Live Preview option
   https://da.live/#/adobecom/da-bacom-graybox
2. Shows authentication error