NFC RFID reading not working - Troubleshooting

INVEO RFID IND LED UNI SLOT RFID reader; 10÷24V; UNIQUE; HTTP,Modbus RTU,Modbus TCP,SNMP

slot- Kantoor Slot - Zwart - Anti inbraak - Tuya App Vingerscanner; Tuya Smart, Smart Life; Bediening: App, Pincode, RFID-tag, Vingerafdruk, Klaviersleutel; CE

222 slot What is the difference between passive RFID tags and active RFID tags? It's truly amazing how RF energy can find slots and defects and

five treasures slot Abstract: In this paper, a compact 13-bit fully passive chipless RFID tag is presented The overall size of the proposed chipless tag is mm x 17 mm