Have this problem also, but not on the Beta version. I don't know why or how, but I was able to bypass the problem. I closed TeamViewer completely on my Mac. Then I accessed my account through the Teamviewer management console in Safari. I was asked to autorize the opening of the Teamviewer app and I did. And after I reconnected to the Windows computer through the app, all keys on my Mac keyboard were working in Windows. Hope this helps!
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