Hello @Marz54 and welcome to the Help forum. Calm isn't listed as a Fitbit compatible app. If there is a way to link your Clam account with your Fitbit account, it will be in the Calm settings. Look for a share option.
Laurie | Maryland
Sense 2, Luxe, Aria 2 | iOS | Mac OS
Take a look at the Fitbit help site for further assistance and information.
Hi @Marz54 the decision to add fitbit to Calm, as @LZeeW has explained, will be made by Calm.
I suggest contacting the Support line for Calm.
I searched Calm's Support and nothing came up.