Ok so you just want to write a basic standard URI record? Easy… it should work no problem. If NFC Tools is not working though, you should try TagWriter (Programming an NFC chip with a smartphone - DT Info - Dangerous Things Forum). If it does not work, then post the full scan info from TagInfo (How to share NFC chip data via TagInfo app - DT Info - Dangerous Things Forum) so I can figure out what’s up.