AWS Amplify - Circular dependency in PostConfirm when access to AppSync is needed

Hi there, I want to save data in a User Table via AppSync, after the user has registered. So this should be done in a PostConstruct Lambda. But now I get a Circular Dependency Error when I want to push via amplify cli between the AppSync API, the Cognito Auth Module and the Post Construct Lambda. I guess that this is a common use case, so there must be solution to this problem.

Best regards, Alexander