99.5%+ of browser user agents are something released in 2010 and later that understand TLS 1.2 just fine.
I have no idea why they would be set up that way, but it's clearly out there.
While this can enabled via GPO, I really wish MS would release a patch that forces these to be on. There is no reason not to at this point.
TLS 1.1 & 1.2 are not enabled by default therefore will not work regardless of compatibility. Try it.