It should work in general, but ISBNs may not work well right now. WorldCat, one of the main sources of ISBN metadata, has gotten more aggressive at blocking automated lookups, so ISBNs for which there isn't metadata elsewhere sometimes can't be resolved at the moment.
If you're having some more general problem, we'd want to know exactly what you're trying and see a screenshot.
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If you're having some more general problem, we'd want to know exactly what you're trying and see a screenshot.