REST CALL getting 401: Unauthorized error while using GET service

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Hello Experts, I'm new to using REST, so here's a brief description of what I've done so far: I created a JSON structure. I generated the import mapping. And created a microflow which does the REST call using the following settings. I’m getting 401 unauthorized exception like           
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That would be the service you are calling returning a 401 – Unauthorized error. You would need to double check what the security restrictions on this API are.

Some things to check… Is the username and password you are providing correct? Is it IP restricted? Are any custom header needed? Does it work if you try to access it from a tool like Postman?

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