Link Under Test Website is returning an empty page

[PrintsCharming]

In the setup the link under Test Website returns an empty page.

Following the steps, I receive the same blank page in my own deployments.

[PrintsCharming]

UPDATE:
It comes up in Chrome and Edge. Firefox still failing.

[akshata29]

UPDATE: It comes up in Chrome and Edge. Firefox still failing.

Thanks. Let me verify and make changes for Firefox. Did test only with Chrome/Edge