Setup a simple REST service.
When I call it, I get this error

If I misspell the name of 1 of the 2 params, it complains correctly.
If I misspell the name of the service, it says it can't find that service.
URL is like this:
https://www.acme.com/R4/REST/R4/Callback_Test?status=1111&message=hello
Latest v8.1
thx