Fitbit Product Experts Alumni are retired members of the Fitbit Product Expert Program. Learn more
That phone isn't on the list of supported devices at www.fitbit.com/devices so it may not be possible to fix this. Hopefully someone with that phone will be able to confirm either way.
It's also worth checking that your Charge 2 isn't in "do not disturb" mode. When you press and hold the button on the fitbit it toggles "do not disturb" on and off.
Best Answer