Hey I had my biometrics today and I would advise you to keep an eye on their screen when they take a photo and fingerprints. 2 of my fingers showed a warning sign saying "mismatch", because of the moisture on the palm, but the officer refused to retake them, he said that should be fine, but I heard lots of cases when people had to take second biometrics appointment, because their fingerprints/photo were rejected due to poor quality.