Your Aegis door lock can use the Sentry doorbell as a Gateway to connect to the internet (if you purchased just the Aegis door lock, there should be a separate Gateway device in the box that serves the same purpose).
First please make sure that your Sentry doorbell has the fingerprint reader module. The module is available if you purchased the Aegis + Sentry bundle.
Install and set up both your Aegis and Sentry. Then, go to Sentry home page -> Fingerprints, and add your Aegis under “Paired Devices”. Don’t forget to enable “Unlock” under “Fingerprint Actions” so that fingerprint scans unlock the door. You can then add new fingerprints under “Normal Fingerprints”