A few things to check:
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If you scan a file you should afterwards see a AcoustId tag in the tags like this:
If the file gets an AcoustId that means fpcalc is working. If it does not load a result from MusicBrainz this just means the AcoustId is not mapped to a recording on MusicBrainz yet or the recording is not in MusicBrainz at all. You can fix this by adding the recording to MusicBrainz and/or load the recording into Picard. Then drag your file to that recording and use “Submit AcoustIDs” to link this AcoustId to this recording.
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Try with multiple files if any of them produces a fingerprint. Not all files will get processed by fpcalc, e.g. if it is only a few seconds long or in a format not supported by fpcalc.
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Check Help → View Error/Debug Log for error messages