Why Is My Touch ID Not Working on My iMac? There are a handful of circumstances that can cause Touch ID to not work on an iMac, including problems with your fingerprint and security settings on the iMac. Here are the most common problems:
- Fingerprint not recognized: If your iMac tells you your fingerprint isn’t recognized, make sure both your finger and the Touch ID button are clean and dry, and then try again. If you have any cuts on your fingerprint, dry skin, etc it could prevent the sensor from correctly reading your fingerprint and so Touch ID will fail. Try repositioning your finger on the sensor, and try a different finger if you have more than one fingerprint set up.
- Password still required: Your iMac will typically require a password when you first start it up, after which you can wake it up with Touch ID. You will also be prompted for a password if your iMac has been on for over 48 hours or if Touch ID fails to correctly identify your fingerprint five times in a row.