Add dynamic url of another site

Hello,

Can someone help me please. I am trying to add an url of another site in one site and make it ready to click on it.
I already have the site link/url in the database. When I try to display the url and click on it. It send me to the parent site not the actual site.
For example: I have www.domaine.com as the primary site.
I have www.domaine1.com in the database.
when I use the dmx-bind:href=“Website” to display the link and send it. It just redirect me to www.domaine.com/domaine1.com

For some reason, the path is not going exactly to another site.