Issue Customized Plesk URL shows "Web Server's Default Page"

[dav1d]

Hello,
I recently changed my plesk URL to plesk.example.com. Now when I click on said URL, it displays the "Web Server's Default Page". Only when I write "https://" in front of the URL, the Plesk interface gets displayed.
There is no automatic redirection. How can I fix this?

thanks in advance.

 

[Bitpalast]

This explains the behavior:

https://support.plesk.com/hc/en-us/articles/360015823179