Hey Arend,
Thank you for reaching out to us!
Sometimes new licenses or license renewals take longer than expected to register with our servers. Therefore, my guess is that your license should work by now.
Please give it another try now and let me know how it goes. If the issues persists I’ll be glad to further investigate your case!
Regarding your second question: it is possible to move your license key from one site to another by following the steps explained in this article:
https://theeventscalendar.com/knowledgebase/moving-your-license-keys/
I hope this helps! If you have any other questions at all please feel free to let me know and I’d be happy to help as best I can!
Cheers,
Patricia