Issue with hostname

I Followed this guide to setup MDT from scratch https://brookspeppin.com/2020/06/26/how-to-setup-powershell-deployment-extension-for-mdt-with-https/ And kinda works but keep getting error above... Where do I set hostname in MDT toolbox or scripts??

Also I tested and internet conncetion works fine

Is this a cloud deployment scenario? Where is the deployment share hosted? Have you set your BootStrap.ini settings properly (please check this for more info https://github.com/FriendsOfMDT/PSD/issues/63#issuecomment-1294133041).

Closing due to inactivity as our policy states.