Print the input. Read this: https://docs.codewars.com/training/troubleshooting

Is "numerology" sample test like this one?

Assert.AreEqual(10, Kata.Numerology("numerology"));

If not, change it.

No:

However if the first sum gives 11, 22 or 33 (Master numbers) , just leave it there and return that number.

Read this again:

given a word, calculate its value based on this chart by adding the values for each letter and then adding the digit(s) of that value.

For example: "codewars"= 34

After this add the digits of that number 3+4=7, so "codewars"=>7

"numerology" == 55

5 + 5 = 10