PhpMyAdmin Error 404 Page Not Found

When I visit domain.tld/phpmyadmin, I always get a 404 by nginx on my up-to-date HestiaCP instance on Debian.

I already checked out these threads and applied various tweaks, to no avail:

Custom template?

If you vistit: domain.tld

You see the website / under construction page?

Indeed I had a custom template running there, mirroring the config panel.
What is the suggested approach here? I find it very unprofessional to permanently have an under construction page at the main domain.

Create a php file:

<?php header('Location:');