Entra Connect Sync Errors Detected: A Read-First Duplicate Attribute, Soft Match, and 8344 Permission Triage

Got a Microsoft Entra Connect sync errors detected email, AttributeValueMustBeUnique, InvalidSoftMatch, or permission-issue 8344? Read the connector and both objects, confirm the engine is exporting, decode the error, check soft vs hard match and AdminSDHolder, then fix the data at its source.