Like it says in the banner on your I screenshotted:
Don’t see your website yet?
Please note it can take up to 72 hours for a new domain name or hosting account to start working everywhere.
Within the first 72 hours after your domain is setup, you may have trouble accessing it. Your account is less than 72 hours old and you have trouble accessing it. This is very well known behavior, and perfectly normal.
It’s DNS cache, which is just how the internet works. It will resolve itself automatically after some time, and it’s not something we have any control over.