Getting AuthFailure with AWS Authorization

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Describe the bug
Setup a GET to https://ec2.amazonaws.com/?Action=DescribeInstances.
Selected AWS Authorization.
Added AccessKey and SecretAccessKey
Set Region to us-east-1
Set ServiceName to execute-api
Clicked UpdateRequest
Clicked Send

Getting back Status 401 with

<?xml version="1.0" encoding="UTF-8"?>

AuthFailureAWS was not able to validate the provided access credentialse6ffc9b3-e599-4010-b86e-59e426e732d8

Having issue with chrome client as well as native Postman 7.6.0 on Mac Mojave.

Verified that AK/SAK works as expected using AWS CLI

To Reproduce
Steps to reproduce the behavior:

  1. Go to β€˜β€¦β€™
  2. Click on β€˜β€¦β€™
  3. Scroll down to β€˜β€¦β€™
  4. See error

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
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App information (please complete the following information):

  • App Type [e.g. Chrome App, Native App]
  • Postman Version [e.g. 6.0.1]
  • OS: [e.g. macOS High Sierra 10.13.2]

Additional context
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Hi was the issue resolved

Please let me know the workaround for this issue