Several factors will make the fingerprints not be recorded by the Xiaomi 14T, such as the dusts and moisture on the scree or the fingers, wrong recorded position and protective film.
We apologize for the inconvenience. Please keep your finger and the phone's surface clean while unlocking. When recording, make sure to move your finger and avoid pressing the same spot repeatedly. It's best to use official screen protective films, as privacy and blue light protectors will affect fingerprint performance.
You can try removing the screen protective film and using face unlocking. If the fingerprint issue persists after removing it, please visit the after-sales service center for fingerprint calibration. We are monitoring this issue and working on improvements. Thank you for your understanding and support.