1. Android
Please “turn on” the NFC function on your smartphone. (Settings → Connections → NFC and contactless payments)
If there is a separate mode setting, please set it to "Standard mode" to recognize the NFC tag.
Please check whether you set the NFC mode as “Standard mode” if the NFC is not recognized.
2. iOS
For iPhones, NFC is automatically enabled.
You don’t have to take any actions to turn on the NFC functions on an iPhone. For iPhones, the NFC recognition area is located at the top of the back of the device. However, the activation of Nemo Album [NFC Type] is only available for iPhones using iOS 13 or higher versions. If the NFC function is not working, please check Apple Customer Service or check if your device is NFC supported.
Apple Customer Service: https://support.apple.com