Maybe a bug. File feedback for sure.
Secondly, reinstall the display and WiFi drivers from the manufacturer.
Issue reported to Feedback. Thanks.
As for the driver's recommendation.... Believe that MS should be providing the correct drivers, as it always has. The same "correct" driver's that allowed the Connection within Win 10, on the same PC/TV.
With our OS being a Beta, we all should expect/report issues such as mine, will be addressed in due course. To me, means that unless this issue is exclusive to me (Highly doubt), MS will offer an update containing the fix as soon as they are seeing more Feedback on this Cast/Connect issue. Just as I have offered up.
But... If someone out there has a fix....
Again, thanks!