Get error in Create new case in Amazon Connect

The error you're encountering while trying to create a new case in Amazon Connect suggests that there might be an issue with the user ARN (Amazon Resource Name) or the instance configuration. Here are a few potential reasons and steps to troubleshoot:

1. User ARN mismatch: The error message indicates that the system cannot find the specified user ARN in the given instance. Double-check that the user ARN is correct and belongs to the instance you're working with.

2. Instance configuration: Ensure that the instance ID (1c52a9e9-bac6-4407-b9f6-2e614cd6338d) is correct and that you have the necessary permissions to access and create cases in this instance.

3. Region mismatch: Verify that you're operating in the correct AWS Region (us-east-1 in this case) and that the user and instance are both in the same region.

4. Cases setup: Make sure that Amazon Connect Cases is properly enabled for your instance. Cases require Customer Profiles to be enabled as well, so check your instance settings in the Amazon Connect console to confirm this.

5. Permissions: Ensure that the user attempting to create the case has the necessary IAM permissions. Review and update the security profile permissions for agents and call center managers if needed.

6. Resource synchronization: There might be a delay in resource synchronization. Try waiting a few minutes and attempt the operation again.

If the issue persists after checking these points, you may want to contact AWS Support for further assistance. They can help investigate any potential underlying issues with your Amazon Connect configuration or the Cases feature.
Sources
Enable Cases - Amazon Connect
CreateCase - Amazon Connect
CreateCase - Amazon Connect Cases