Nukii was not close enough to the phone when unlocking
Nukii uses its built-in NFC antenna to communicate wirelessly with your phone. It is similar to the technology used for transaction payment on cell phones or transit cards used for transportation.
Therefore, when unlocking the device, you need to place the Nukii close to the phone's NFC antenna to unlock it properly.
The time Nukii is held near the phone is too short
When unlocking the Nukii, if the time spent close to the phone’s antenna is too short, the NFC data transfer will be unsuccessful and the unlock will fail. Please hold for 3 seconds after the check mark is displayed to ensure the unlocking is successful.