got a new reader (NOT the app) and it would not register the sensor.
on the third call to the company he said it was probably because we had an old switched off reader!
the old reader is in another room and not been used in at least a year.
his theory was that the old reader is probably giving out a bluetooth signal that the new one picks up!
Take the old reader to another house, to the garage, to a shed in the garden.
Wrap it in tinfoil.
Just make sure that it is far away from the new reader - far further than Bluetooth can possibly reach.
Then test again to prove it is or isn't the old reader.
Edit: or take the new reader with you when you go out. On the bus, in the car, nice walk. Then try and register. Either way make sure the new reader and old reader are well apart.
I've got my old reader fully charged next to me, waiting to download Libre 1 data, which I haven't got round to doing. No issues with registering Libre 2 on new reader at all for me at any rate.
well I have my old Libre1 reader and my new libre2 reader about a foot apart and my libre2 reader is working fine with my libre2 sensor both readers were in the same room when I started my latest sensor with the libre2 reader I think you should request a replacement.