It may be in Valet Mode.
Do a Google Search ( Ford Factory remote start in Valet Mode ) and you might find the Sequence needed to take it out of Valet Mode?
Just an example of what I found...............
Service or valet mode is indicated with 6 beeps.
And to enter/exit valet mode, you turn the key on/off 3 times, starting and stopping in the off position, not starting the car. In other words, key in, 2 clicks forward, 2 clicks back, forward, back, forward, back.