Amazon API Details Invalid

Hi,
Getting the following error while trying to fetch details from Amazon.
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Amazon API Details Invalid
We could not connect to Amazon because your Amazon import settings are incorrect.
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I have been using Affiliate ID for long and for sure its correct. I have just created Amazon AWS developer account and created keys but that’s not working.

Anyone can please suggest how I can create Developer keys on Amazon AWS? Amazon AWS seems to be very confusing, creating users, roles, groups etc. Can anyone share specific link for just creating API keys?

Regards,
Imran