Use one NFC tag with multiple phones and users

[WorkHard]

I tried using your method originally but there are 3 downsides for my scenario:

1. By registering and writing to the tag in home assistant every time the tag is scanned both applications show the notification. (home assistant shows that it detected the tag and siri shortcuts. No way to turn it off).

2. I couldn’t get it to run in the background. Meaning, just by taping the tag with the phone, the home assistant would sometimes not run or require an additional click. I just want it to work without prompting me for confirmation.

3. This is for a door lock. So I highly prefer not writing anything to the tag but rather just use the tag’s ID and register it in the siri shortcuts.
   Siri shortcuts then takes care of firing the event and notifying home assistant.

This article describes the limitation of scanning NFC tags in iOS and running the action without confirmation.
scroll down to “Shortcuts Automations” section:

How-to: Using NFC Tags to trigger device or home automations

or here:

NFC Tags without clicks

Looks like an Apple limitation: On iPhones that support background tag reading, the system scans for and reads NFC data without requiring users to scan tags using an app. The system displays a pop-up notification each time it reads a new tag. After the user taps the notification, the system delivers the tag data to the appropriate app. If the iPhone is locked, the system prompts the user to unlock the phone before providing the tag data to the app.