What errors do you get when you try to invoke from browser/postman. I attempted to replicate your problem but, your mapping template worked fine in my environment. I tried using the GET-Method Execution TEST, a chrome browser, and through Postman. It worked successfully. My invocation looks like the following:
Did you remember to include the "stage" name with your URL?
Did you remember to "Deploy" your latest version of API?
Ok, thank you very much. It was a stupid problem.
I had no idea of the existence of the "Deploy API" action, that's why the changes I did where not being used. It is fixed now, all I had to do was deploy my new version of the API
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