If you want to use an existing SSL certificate with a different domain, you can reassign the certificate in IONOS. Here's how:

Change Domain Assignment

  • Log in to IONOS
  • Click on Menu > Domain & SSL  in the title bar.
    The page listing all your domains is displayed.
  • Click on Manage in the section SSL certificates under Portfolio. The overview of your SSL certificates is displayed.
  • Click on the three dots in the Actions column to the right of the domain whose certificate is to be reassigned.
  • Click on Reassign SSL certificate.
  • Select the desired domain.
  • Select the desired purpose in the field Change purpose.
  • Read and accept the terms of use.
  • Click on Reassign SSL certificate.

The SSL certificate will now be set up. You can check the setup status at any time in the SSL certificate overview.