You're lucky if you can get any kind of phone to connect over USB to your MFT console. It is the singular most disappointing thing about my new truck. I can't connect my Samsung Galaxy S4 to it - and it's not like that's a particularly obscure phone. The wifi in MFT is as close to useless as it's possible to be and still be functional - you can connect it to any wifi network so long as the password is 10 characters or less - so neither of my local networks will connect as I use long passwords - and even then, there's nothing you can do with it. In infrastructure mode, you could make your MFT an access point, and plug a 3G/4G/LTE dongle into one of the USB slots, and then any devices that connected to your vehicle could use "its" internet... but even then, Sync/MFT has no applications that would make use of the net. You would think at the very least you could pull traffic data or CDDB/track info down off the net, but there is literally, and I mean that in the truest definition of the word, literally nothing that Ford Sync/MyFordTouch can do with an internet connection.
Anyway, excuse the rant; back to the scanner. Regardless of all the above, Uniden doesn't pass audio over the USB cable. So connect a simple stereo patch cord between the headphone jack of your 436 and the audio inputs. (I can't remember right now but I think the AV inputs on the vehicle are RCA plugs, so you will probably actually need a 3.5mm stereo to twin RCA cable.) Then select A/V-Input on your MFT screen and you should get the scanner audio.
I'm also willing to bet if you could find one of those little bluetooth transmitters (something like
this), you could trick it into pairing as a Bluetooth device with MFT. Then hit your media button, say "Bluetooth Stereo", and see if it'll play the scanner audio.