I have the same error but with SES. I would like to use the IAM Role which has the AmazonSESFullAccess and the AdministratorAccess-Amplify. But im keep getting this error what you mentioned: [CredentialsProviderError]: Could not load credentials from any providers. This is how im using it.

"use server" 
import { SESClient, SendEmailCommand } from "@aws-sdk/client-ses";
const sesClient = new SESClient({region: process.env.SES_REGION});

Have you gotten any solution for this issue? Ive tried also adding fromNodeProviderChain() but same result.