How to block incoming connections?

Greetings

I have a bunch of users with non-enterprise licenses using Teamviewer 14 to connect to a supplier system that has supplier provided enterprise licenses. I have at the moment not the option of setting up my own enterprise license for my users who must use Teamviewer to connect to the supplier system. I'm no Teamviewer expert but as I understand some of my users are now also using their PC installed Teamviewer to access their computers from home, which is of course not intended.

Is there some way for me, other that pruchasing an enterprise license, to remotely block my users from accessing their Teamviewer from the Internet?

Regards

Fredrik