Hello @Colls thanks for bringing this to my attention, I'm happy to give you a hand with your syncing concern and a warm welcome to our Community Forums!
Seems odd that your Charge 2 is not syncing anymore with your iPhone, thanks for troubleshooting your device prior posting. If you haven't already done so, I recommend you to try the steps from our help article: Why won't my Fitbit device sync? and let me know how it goes.
Looking forward to your reply, let me know if you have any additional questions.
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