Nothing can be read from a biometrics appointment other than that one has been scheduled to have their biometrics taken.
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A repeat biometrics appointment probably means the FBI did not accept the fingerprints, because either your fingerprint technician did not do a good job or there is too much ware and tear on your fingertips.
Don't be concerned. If you don't know of any reason why there would be a problem, you should assume there isn't. Other than, perhaps, smudges on your first set of prints.
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