In this forum I often have read that for example app <=> companion messaging is not working om Windows 10 Mobile. I spent a lot of time to find out if some misbehavior is caused by my implemation or by platform specific problems. Trying to pair a Ionic with different mobiles phones took me into situations where only factory result was the possible solution. And I even had the situation where the factory reset produced a device with "Data not cleared" where you only can send back the device.
@JonFitbit : Would not it be possible that Fitbit clearly defines what works and what does not work on the various platforms.
Fitbit Developers oversee the SDK and API forums. We're here to answer questions about Fitbit developer tools, assist with projects, and make sure your voice is heard by the development team.