I have deployed a form function at https://www.wolframcloud.com/obj/burbery1/multiples%20of%20the%20SI%20coherent%20unit%20for%20force that finds a multiple of the SI coherent unit for force with computed quantity. For example, it converts 9876543 N to 9.876543 MN. I entered weight of 10000000000000000000000000000 kg and it evaluated to

UnitConvert[Quantity[10000000000000000000000000000, "KilogramsForce"], "Ronnanewtons"]

Is there a reason this didn't evaluate? I want to ensure the function returns a quantity, not a line of code. I think the issue is that ronnanewtons use the new prefix ronna just introduced in November of last year, so maybe the Wolfram Cloud Server isn't evaluating them. I tested the expression with CloudEvaluate and it worked though:

CloudEvaluate[
 UnitConvert[
  Quantity[10000000000000000000000000000, "KilogramsForce"], 
  "Ronnanewtons"]]

returns

Quantity[196133/2000, "Ronnanewtons"]