Redirect issue

I have a domain name (stores100.com) which using the Shopline platforms, it seems redirect successfully,

However when I type "http://stores100.com" in the URL bar the redirect is not performed and show "This website is temporarily unavailable".

In the DirectAdmin section I have follow the instructions told by Shopline, added a Site Redirection entry type:301 redirect URL https://www.stores100.com, it still failed to land to https://www.stores100.com.

Should I miss some process , and I found some of the forum said is about the cert, is it mean that I miss the cert when I buy the domain?

Can you please advise? Thanks a lot.

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