DEF empty warning, but DEF tank is FULL.. Anyone have this issue?

There a currently 20 i know of in ND. All with Max Towing gears... 3.73.. it is a math error in the computer and they can't figure it out. I am beyond sad...
 
My truck has this issue every now and then. I was told the system might need to be reflashed, but now I’m seeing that might not be the fix.
 
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