If the charger does not respond to your RFID tag, the RFID reader is probably picking up interference. Common causes are an unshielded or poorly shielded ethernet cable, a switch or router close to the charger, or a meter cabinet on the other side of the wall.
Find the cause
Connect to the hotspot of the charger. Disconnect all devices from the switch or router and check whether the tag works. If it does, reconnect the devices one by one until the problem returns; that device is the cause. If it does not, connect the charger over WiFi only, without the ethernet cable, and check again.
If the tag still does not work, contact your installer.