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What happens if you don't put in all the white space?

--data $(printf '{"mName":"%s","oName":"%s"}' "$mname" "$oname")
Or use an intermediate variable:
json_data=$(printf...

--data $(printf '{"mName":"%s","oName":"%s"}' "$mname" "$oname")may work too. Notice how I've used single quotes for the format string to preserve the double quotes without escaping them.

If that...

I've discovered a handy little tool called jq which can be used to build, display and manipulate JSON. If you are on Linux you can probably install it from the repository. Then you could change your...