How did you try to import this data? Calibre will need at least a title and an author to go with the ISBN. Once you have that, when you try to download the metadata, most of the metadata source plugins will use the ISBN to find the book. If the ISBN is wrong, or incorrectly formatted, it might prevent the download. And of course, you need to use a source that has the ISBN on record.
For specific reasons it failed, the metadata download logs what it did. You would need to look at this, or post it for us to look at and work out why it didn't work.
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