I can not login to https://www.xfinity.com/auth from abroad

I'm a new customer moving to the US next week.

I successfully created an xfinity account, and ordered internet install, but for some reason I can not login to xfinity.com.

Already try different browsers, incognito mode and VPN.

Nothing works.

Note I do have the right login/password. The problem is the site does not authenticate me.

Please advise

Tzach