If it can be NFC scanned it will work with the app.
But the app also logs “airshots” too but you can pick “flow check, I did not inject this insulin” when logging needle primes.
Librelink gives you a prompt when scanning the pen.
Maybe think of it the other way round and do it from the Libre app. i have two Novo plus pens that were working wonderfully with Libre .2, got switched to Libre 3 , which is a different app and the opportunity to connect a pen or pens has gone.
It should be in the main menu, below the reports section, then the section below that should have ‘connect pen’ or similar.