Hi there @Aziu, let me start by giving you a warm welcome to the Fitbit Community! Note the Xiaomi Redmi note 4 is not a compatible phone. So we cannot guarantee many features will work as is expected.
In the other hand, if you are trying to connect MobileTrack, note this features is exclusively supported only by a few devices regardless if is listed as compatible. So in this case you are not able to use this feature since the option is not supported by your phone.
Hope this helps and let me know if you have additional questions.
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