A. 1. Re-register your fingerprint: Go to your device's Settings > Security > Fingerprint and remove the existing fingerprint. Then, re-add your fingerprint to ensure it is correctly registered. 2. Check app permissions: Go to Settings > Apps > Sandals & Beaches Resorts > Permissions and ensure that the app has permission to use your fingerprint.

B. 3. Update the app: Make sure you are using the latest version of the app, as updates may fix bugs related to fingerprint login.