Hello Siun17,
We'd like to assist you with getting NFC scanning working as expected. The following steps may be able to
correct this behavior:
• Restart your iPhone. This may seem like a simple step to take but can often resolve several issues.
- "Press and hold either volume button and the side button until the power-off slider appears.

2. Drag the slider, then wait 30 seconds for your device to turn off. If your device is frozen or unresponsive, force restart your device.
3. To turn your device back on, press and hold the side button (on the right side of your iPhone) until you see the Apple logo."
• Be sure you're running the latest software version. Completing this step ensures that your device has the latest fixes. (Secure your data with a backup): Update your iPhone or iPad
If the issue persists, we suggest that you reach out to Apple. They will be able to look further into this with you:
Get Support
Have a wonderful day!