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Could you please tell us the operating systems you are using and their exact versions, and also the exact versions of TeamViewer that are installed on your devices?
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Main: Mac OS Sierra 10.12.6 Team Viewer Version 14.3.4730Remote: Windows 10 Team Viewer Version 14.3.4730
I've tried the Remote on Numerous Different Versions of Windows inlucding WIndows 7, and 8 as well as all versions of windows 10. None of them work and all give the same error. The weird thing is if I choose Remote Control using windows authentication and enter the Windows user name and password I am able to connect just fine.
I replied to your post here: Mac to PC Remote Computer "Unable To Connect Reason Unknown" Partner Still using an older version of TeamViewer