For anyone trying this, it is NOT port 5983. I spent too long scratching my head on it. The correct port is TCP/5938. (as in, your PC will talk TCP from a random-high-number port to the TeamViewer servers at destination port 5938). Had a coworker try inserting the firewall rule just to make sure I wasn't going screwy. His dyslexia kicked in and he read 5938 on the above post and viola that worked instantly as described. Double checked with TV support documents (should have done to start with) and the correct port is TCP/5938.
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