Hello @OmarG.
As you mentioned the Xiaomi A2 is not part of the supported devices list. This means that the app has not been fully optimized to work with that phone.
As long as it fulfills the minimum requirements, Android 4.4 and Bluetooth 4.0, there is a possibility that it can work but we cannot guarantee it. Some users of unsupported devices have mentioned that following these steps helps with the syncing.
If none of the above works, you could try to use a computer or another mobile device to try and sync your Fitbit to your account. Click here to get instructions on how to sync with other devices.
Having said all of that, and to answer your question, at this moment we do not have any details on when we can expect the phone to be added to the list. Perhaps you could post about it in our Feature Suggestions board so that other users could support the idea with votes and comments. Be sure to read the FAQ if you have any questions on how that board works.
Let me know if you have any further questions.
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