After a Source Subscription job completes, an error appears in the Job Error Log section of the Job Details page: No entities present.
There is no column header name in the source file that matches the Key Column(s) defined in the subscription File Definitions.
Note: The Key Column name is case-sensitive.
Source Subscription Job definition:
Check the column header name in the source file. Make sure the Key Column header is consistent with the value in Key Column(s). Then, run the subscription job again.