Generally, when you publish your first landing page, it will be connected to Landingi’s default domain and looks like this: landpage.co/xyz.
I suppose you already know that we always recommend publishing landing page on your own domain/subdomain. It is the best solution to achieve a successful campaign using your landing page.
Your domain/subdomain should be name in connected to your landing page content. If you did not change a landpage.co domain, bear in mind that publishing your landing page with this domain may cause problems in some platforms. It is not recommended to use them apart from of testing.
This is the permanent situation on Facebook. This social media provider does not accept such domains.
So, remember – publish your landing page on your own domain/subdomain.