API Gateway 403 with IAM authorization enabled

Question

I've created an API on API Gateway and without authentication I'm able to access the API without any issues.

I then enabled IAM authentication and now I get 403 on Postman and this message:

{
    "message": "Forbidden"
}

On Postman I'm sending the authorization as AWS Signature and still get the same error.

On AWS I'm have full access to API Gateway since I have AdminFullAccess permissions.

I don't get any headers on the response that could help me debug the issue as mentioned here: https://aws.amazon.com/premiumsupport/knowledge-center/api-gateway-troubleshoot-403-forbidden/

Any ideas?

Thanks

Answer 1

The request doesn't work on Postman because I have multiple profiles.

I got this working via awscurl and by specifying the profile.