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Saving credentials to Amazon Cognito

Following the guides here : https://auth0.com/docs/integrations/integrating-auth0-amazon-cognito-mobile-apps & https://docs.aws.amazon.com/cognito/latest/developerguide/cognito-user-pools-oidc-idp.html#cognito-user-pools-oidc-idp-step-2

I’ve tested the OIDC IdP configuration successfully. But I still can’t see that on login with Auth0 any credentials are sent to AWS Cognito. As the user pool still has no users.

Please advise as the docs aren’t clear especially on:

Finally, grab the ARN of the role that was automatically created in the previous step from the IAM console this value will be used when sending credentials to Cognito.

There is no instruction on what to do here or in the AWS docs.

I am using the react-native-auth0 library for a react-native app.