Lincoln MKT 2017 Owner's Manual page 466

Issue
iPhone
MKT (TP4) , enUSA, First Printing
SYNC 3
Cell phone issues
Possible cause
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Your iPhone is now set up to forward incoming text messages to
SYNC 3.
Repeat these steps for every other SYNC 3 vehicle that you connect.
Your iPhone will only forward incoming text messages to SYNC 3 if
the iPhone is not unlocked in the messaging application.
Replying to text messages using SYNC 3 is not supported by iPhone.
463
Possible solution
Go to your cell phone's Settings.
Go to the Bluetooth Menu.
Press the blue circle to the right of the device named with your
vehicle make and model to enter the next menu.
Turn Show Notifications on.
Disconnect then reconnect your iPhone from the SYNC 3 system
to activate this settings update.