Katya, I'm sorry, but I'm sure I'm following the instructions according to the tutorial after repeated tries at deleting all of my prior services - but it's still not working. If someone very recently doing the tutorial from scratch can confirm that it's me I'd very much appreciate it.
BTW, I continue to not be able to easily change the service name to "GetCustomersWithinRange" - the field seems to repeatedly drop characters as I type them, and then later display them. I don't know if this is related to my main issue.
This is disappointing, because this tutorial has great relevance to my intended app. Thanks anyway for your time Katya.