@SteveJG thank you very much for your reply I've reviewed the previous threads on the Google forum. However, I'm still not sure with my issue. I'd like to share some links that we insightful regarding NFC and AI2 but didn't exactly answer my question in hope that they are helpful to others.
For NFC testing purposes I've found this NFC app to be useful. When I use this app to scan my AI2 NFC enabled app I get the following:
MIT provides an excellent NFC tutorial but it requires using an NFC sensor (not second phone).
If looking for RFID scanning with android, it's possible but it is suggested to try Flutter.dev or something else:
A phone can read a 13.56MHz RFID tag. However, the App Inventor NearField block can only read an NDEF text message from an NDEF formatted NFC (ISO14443A/B) tag. Unfortunately it cannot read the RFID serial number.
NFC is one of the most powerful capabilities on a mobile device in existence today. Very concerning there isn't more conversation about it on here. Hoping to get to the bottom of this. Please let me know the best way to go about reading and writing between phones using the NFC component in AI2. Thanks guys.