Maybe it’s time for a visit to a Genius Bar or the online Apple help and check if the nfc is actually working on her phone. Sometimes they can get some idea of the issue with the online chat diagnosis
Thank you, but you don’t. I’ve been using my iPhone 8 to scan my daughter for months now, and it doesn’t matter when you use your phone for the first time, as long as you use the reader first. You can scan with your phone hours or days later.
My daughter’s phone won’t scan anything at all, not just the libre sensor.
Hoping it is the parental controls stopping it. Trying again when she is back from school.