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Good to see you participating in the community for the first time @Alios.
Thank you for sharing the details regarding Sense 2. I'm sorry to know the difficulty that you are experiencing.
I'm sorry to know the inconvenience that you are experiencing with the devices. I'd try to help.
Please, try logout of the Fitbit App and restart the watch and phone. I'd suggest checking the tips of this article: Why won't my Fitbit device sync?
In addition, follow these steps please:
Unpair your Sense 2 from your phone's Bluetooth and Fitbit app.
Best Answer