An Unknown Error Has Occurred #200 Cloud Migration

What is the cause for the error "An Unknown Error Has Occurred" during migration from On-Premises Orchestrator to Automation Cloud?

Issue Description:
This error can occur during a cloud migration when the user has not properly filled out the required redirect and destination URL fields.

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Root Cause: This error is caused by providing incorrect values for Redirect URL and the Destination URL. The values provided are the URL of the cloud Orchestrator for both the Redirect URL and the destination URL. The former should have been http://127.0.0.1:8888/auth/ and the latter should have been the URL of the Customer's On-Premises Orchestrator.


Resolution:
Ensure that the Redirect URL is http://127.0.0.1:8888/auth/ and the destination URL is the URL for the On-Premises Orchestrator.

Refer Automation Cloud - Using The Migration Tool .