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Welcome to the Fitbit community, @Berla!
Sad to hear that you're having an issue with on-wrist calls on your Sense 2.
First please make sure that your phone meets current Fitbit system requirements to have all functions of your device operational:
Next please have a look at 'Why don’t on-wrist calls work on my Fitbit device?' following the link below to hopefully get things fixed:
How do I take on-wrist phone calls with my Fitbit smartwatch?
You might want to use Google Translate to have easier access to the contents of those links: