This item has been identified as an outstanding known issue.
Issue
When running an import that has soft failures (e.g. a list import that fails to import due to 'item not located in list') these failures are not reported by the NUX UI. In the classic UI they show as having a warning icon, with a grey soft warning icon next to the message x Updated(x with errors).
This will occur for all non hard failures including ignored items.
Classic

NUX
Note - you can download and view the errors, they are just not reported in the UI

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Internal Reference: ANI-440