I just registered a new domain and wanted to test a site backend before I commit to purchasing hosting on Godaddy, as well. I have used the free trial hosting service with other domains I own here in GoDaddy but the new domain isn't showing up in my list of domains to add a free hosting to.
I mean the choice available in:
My Products > WebHosting > WEB HOSTING WITH CPANEL (FREE TRIAL WITH DOMAIN) > Set Up
Welcome to our community! It can sometimes take a little while for newly registered domains to appear within your account. If you're still not seeing it there and it's been over 24 hours, I'd recommend reaching out to our support team to have them review your account and see if they can figure out why it's not appearing.
Heather - GoDaddy | Community Moderator 24/7 support available at x.co/247support