Why the NFC does not work on the watch?

The availability of NFC (Near Field Communication) can vary depending on the country and region due to different regulations and service support. If you are interested in using NFC-based cashless payment services with Xiaomi wearable products, you can check the supported banks and services on the official Xiaomi website: https://www.mi.com/global/support/nfc-bank.
Since NFC functionality can differ based on location, it is recommended to refer to your local official Xiaomi store or website for detailed information regarding availability, supported payment methods, and compatible financial institutions.
If your Xiaomi Watch supports the NFC function and payment services, however it is not working, please try the following troubleshooting steps:
1. If NFC payments fail, try removing and re-adding your payment cards through the Mi Fitness APP;
2. Go to the Xiaomi Pay interface in the Mi Fitness APP, tap the settings icon in the upper right corner, and try to fix the issue through the APP;
3. Reboot your watch to resolve temporary software issues;
4. Check for the firmware update of your watch and make sure it is up to date;
5. If the above methods can’t solve the problem, consider resetting your watch to factory settings and setting up NFC again.
If the issue persists, it could be a hardware issue of the NFC sensor, and please contact the local after-sales service center for further assistance.