Hosting with 1and1

I found this article in the forum and I used the same method, but in webflow the domain gaertnerei-hagl.de is not marked as connected, on the other hand the subdomain www.gaertnerei-hagl.de is connected.

The I can access the webpage perfectly with the exception when I type in https://gaertnerei-hagl.de it won´t work.

Can anybody please help?