Mobile sensor compatibility

Good night:

I have put the sensor to my mother to try because she has started using insulin, the fact is that she has an Oppo mobile and I cannot scan it because the option does not appear.That is that the phone is not compatible?I already have it ... taking advantage of my vacation to the bad I will scan it with my mobile, but I go on, it would have to have taken it into account before doing the expense and putting it.I did not imagine that I was going to give me problems with the 2, so I did not buy the 3

I have an Oppo A91 and it works both on 2 and 3, I don't know other models

Does it have NFC?If you don't have

It is an Oppo A79 and I have enabled the NFC

3 Mobile at home without using, one of them compatible because it comes in the list, I have updated it, because the NFC does not enable it, I give it and when I go out of disabled so, more, it will not have any other one to spend the day scanningWith my mobile

I have an Oppo and it goes without problems.
Look at the sensor app and Android version updates

With Oppo A74 it also works well