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Your Amazon account secret access key. There is no way to get this secret key unless you saved it when it was created.

Amazon Mechanical Turk does not support IAM users. For more info visit. Mturk Docs. Also make sure your AWS account is linked to Amazon Mechanical Turk account. Visit https://requester.mturk.com/developer or https://requestersandbox.mturk.com/ developer based on your mode of platform to link account.