Try topping it up, in case it hasn’t triggered the sensor. You could also try changing the settings in the app to ask the car for updated info at each start (of the app).
There's also a T shirt message with a response to that but I'd better not post it as it's a little bit too rude........I've got a T shirt with the oft used Technical support phrase (and highly amusing on the IT crowd)
"Have you tried turning it off and on again?"
It's amazing how often it does actually work 😁
I'm getting the same issue. Car is full of fuel tried rebooting Infotainment system but still the same... any ideas?