Hi there @Markhoff! A warm welcome to the Fitbit Community!
Thank you so much for reporting this situation.
Have you already checked if you can update the Fitbit app in the App Store?
I suggest you try to do the following:
- Turn off Bluetooth on your phone; wait 10 seconds, and then turn it back on.
- Restart your Sense 2. See How do I restart my Fitbit device?
- Turn your phone off and back on.
- Remove your Fitbit device from the list of connected Bluetooth devices on your phone or tablet:
- On your phone, tap Settings > Bluetooth.
- Tap the information icon or gear icon next to the name of your Fitbit device.
- Find the option to forget the device.
- Try setting up your device again. How do I set up my Fitbit device?
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