Tor Browser thinks Microsoft Silverlight is not installed

I'm running Windows 7 Pro. I have Microsoft Silverlight installed. I open a Tor Browser and go to the Netflix website. I login to my Netflix account and try to play a movie. I'm located in the US, but due to the Tor browser, I'm logged into a Netflix site outside of the US.

Netflix is asking me to install Silverlight even though it is already installed.

Any insight on why Netflix can't determine that?
 
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