on the preview version 13.0.5693, it is not possible to enter a valid (new) license number for a business license through "Extras, acivate license" as it is stated on he invoice:
tested on OpenSUSE Leap 42.3 64-bit
Thanks for your post.
I apologize for the confusion, there was a change in the licensing for TeamViewer 13: Please activate your TeamViewer 13 license on your TeamViewer account via the Management Console.
You can find a description of how to activate your license in this Knowledge Base article.
Thanks and have a good day, Esther
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