"... Read could be my hands are to dry. Sounds crazy but that's what they said"
Yep, that will definitely do it. My hands get extremely dry during the winter. Applying some hand lotion or wetting your finger slightly usually works.
When medical professionals do an ultrasound scan they typically apply gel to the area. Same concept with in screen fingerprint scanners. If your finger is too dry, the scanner can't properly read it.