If you have a Vizio V665-69 you will have no luck getting MLB directly through Apple TV, must use a ROKO or plug your laptop into an HDMI input.

After spending incredible amount of hours, finally, asked the direct question to apple.tv and found out that it will not support access to MLB, on my Vizio. I refuse to deal with Google so I guess I will just watch the Mariners games with my laptop hooked up. Thanks Mariners Management for ruining everything in your pursuit of fortune.