I am trying to write an NFC 215 chip with an i phone 12 pro max. I am using NXP tag writer app. on the NXP tag writer app I click "new", "website" then i enter the description information along with the URI type and URI data. I then click "save and write" I get a notification saying "NDEF recorded saved successfully in my dataset". When i close the app and tap the chip it doesn't do anything. I also tried using another phone and still no luck. Anyone have any ideas or suggestions? 
Hello @Erik3
The message "saved in my dataset" means the data was stored locally in the app, not yet written to the chip. Please try:
In TagWriter, go to "My Datasets" → select your entry → tap "Write"
Hold your iPhone close to the chip until you see a write-to-tag confirmation
Also, you can use the NFC TagInfo app to scan the chip and verify its current contents and status.