Welcome to our Community @Chrisgolf. For this other calendar sync with your Alta is require to be selected as the default calendar on your Fitbit app. This can be done by going to your device settings by tapping on your main Dashboard your tracker. Then tap again your tracker tile and in the notifications settings go to Text and call notifications. If the calendar is supported should be display on your Calendar options; otherwise it will allow only the default of your phone which in the case of the Samsung phones is the S Planner.
See you around and hope this helps.
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