If that doesn’t work, then you have to deal directly with the NTAG216 by sending commands. You can use NFC Shell to do this;
Send the following lines in NFC Shell;
1B FF FF FF FF
A2 E3 04 00 00 E3
The first line sends PWD_AUTH command (1B) followed by the password. The second line writes the AUTH0 byte back to E3 so only the configuration data pages are password protected. After that you should be able to write normally to the user memory.
Tap send button…
Tap implant to phone