May TeamViewer licenses be transferred from one party to another?

Yes, TeamViewer permits the transfer of software licenses from one party to another. However, the EULA only covers the usage of licenses through related companies.

In order to transfer licenses from one party to another, you will need to fill out a confirmation letter and make this letter available to TeamViewer.

Sources:

TeamViewer_Formular zur Lizenzübertragung (only available in German)

EULA_TeamViewer 2017-02-01