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Hello @Ruby1975, welcome aboard to our Fitbit Community. If you are seeing your Dashboard on your mobile app note that there is a grand tile where is display all your main stats like steps, calories, distance and so on. (See screenshot below)
This might be different if your tracker is not paired to your account. Since calories are calculated in part by your Dashboard is possible this is what is happening. So make sure your Fitbit account has a tracker paired. You can confirm this by going to your Account tab and if you don't see your tracker on the section of devices, then you need to pair your tracker back.
If you need more help with this the following post will provide you the steps you need to follow.
Hope this helps and let me know if you have additional questions.
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