[Gelöst] Registration problem, development site message

We have completely rebuilt one of our websites (isst-unna.de) and now have a problem with the registration at WPML.

The new site was initially created on a subdomain and marked as a developer website at WPML (dev.isst-unna.de), while the old website was still productively active under the original domain (isst-unna.de).

We then moved the newly created website to the web space of the old website. Unfortunately, however, the footer of the new website on the domain isst-unna.de still displays the WPML message that the site is a development site ("This site is registered on wpml.org as a development site. Switch to a production site key to remove this banner.").

What do we have to do so that the site can finally be properly registered and the completely false message disappears? How can the site key be changed?

What have we already tried to solve the problem:

1. we have since uninstalled and reinstalled the WPML Multilingual CMS plugin: Unfortunately, this had no effect.

2. we have deleted the old key and the old registration of the domain with WPML (versteckter Link). Instead, we created a new key by adding a new page (versteckter Link). We then uninstalled and reinstalled the WPML Multilingual CMS plugin: This also had no effect.