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There are no error messages but querying the DUNS number will begin to return fewer results than expected.
The cause of this issue is that the DUNS number is always 9 digits long. There is the possibility that a change in how an upstream tool handles the number will drop the leading 0 in the numbers that are being matched.
The resolution is to check to see if the DUNS numbers are 9 digits long, and prepend a 0 if they are not.