(EN) What should I do if my NFC transponder is lost or stolen? Alexis Seyfried 16 January 2020 12:30 Updated If you lose your NFC transponder, please contact the lock owner who issued the NFC transponder for you. The lock owner is then able to deactivate the NFC transponder. Related articles (EN) How to deactivate a lost or stolen NFC transponder. (EN) Can I unlock without internet connectivity? (EN) Can I use any NFC transponder with Tapkey? (DE) NFC Transponder gestohlen oder verloren? (EN) Check & sync lock-specific information.