My domain got a new name. Now I can’t activate my theme at the new domain.

Hello team, two weeks ago my domain "juergen-schmieding.de" got a new name: "juergen-schmieding-fotografie.de". On February 18, 2025 I have bought a new license for "juergen-schmieding.de". At Siteground I installed a redirection to "juergen-schmieding-fotografie.de". At Wordpress exists only one website which needs the theme "Clean Fotografie Pro". Could you fix this problem? Thank you in advance. Juergen Schmieding