Where did you guys buy your Fitbits from? I bought mine from Amazon UK and I'm wondering if this has something to do with "location" being tracked for purposes of installing apps by where the devices were manufactured rather than where the user is - e.g. Amazon selling devices on their UK website which were manufactured somewhere outside Europe. This kind of thing has been known to happen on other kinds of devices but would be pretty stupid for Fitbit not to have accounted for if it's by accident. Some brands have done this in the past to strictly stop (and entirely prevent) users from using VPNs or travelling to other countries to activate features that they shouldn't be able to use in their home country where the device is mainly used.
I also found other location settings in the Fitbit app on my phone - where it decides whether to set a specific location or set to "Automatic". I tried both manually setting my time zone and location and also allowing each to be set to Automatic, but neither of these fixed the problem. I did notice however that when switching on "Automatic", my time zone remained correctly set to London even though it was greyed out, whereas my location defaulted to United States when greyed out or turned back to manual (although this shouldn't have been a problem because ECG is also now authorised in the US too).
The fact that no location settings fix this and neither does being tracked by either wi-fi or mobile network work suggests to me that the problem is in-built and decided by device serial number (manufacturing location) or something similar - and could be something Fitbit have done on purpose to stop users being able to activate ECG in countries where it's not permitted.
I specifically bought my Sense for features such as ECG and specifically bought it from a UK retailer, so if this isn't fixed within a month I'll be returning my Sense for a refund.
