I'm using AWS Amplify in order to use PubSub for publishing to AWS IoT Core, for that I've setup User and Identity pools, in identity pool I've setup the identity providers as this user pool, but when I sign in (used Amplify Auth) to my app to use the PubSub feature, I'm getting the error as stated in the title.

I've tried checking the correct configuration of the user pool, the app client that sits with the user pool, then the identity pool, the IAM role assumed for this identity pool, the policies and trust relationships for this IAM role. When the same role is assigned to the unauthenticated user (guest), I'm able to publish to the IoT Core, but when the role is tied to the authenticated user, I am getting the error, couldn't find anywhere about authorizing the user/identity explicitly