I was wrong.
Using RIGHT and a different cut of data (a more macro sample of the record) ultimately ended up giving me, “NaN”, which if I’m not mistaken, is a geek term meaning a number was not able to be coerced from the expression.
Funny thing is, I could see it produced the desired result in the Slice as a Virtual Column, but when applied during an Action from the Virtual Column to the real column, the phone number changed from the expected result to NaN.
Any thoughts?