Welcome to the Forums @GANESH333.
Welcome to the Forums @AnoniemC
At this moment the OnePlus Two is not a compatible device and as such there might be issues with the app. The developer team is aware of the need to add new devices to the list of compatible devices. There are some users who can synchronize with non-compatible devices. If your phone meets the requirement of Minimum Supported OS (Android 4.4 KitKat), it might work without any issues.
In case it didn't, you can try these troubleshooting steps. Some users of incompatible phones have found them useful.
Note that we don't guarantee that the synchronization would be will be successful as we are still testing on this phone model.
As for installing the app itself, you should be able to to do by going into the Play Store on your phone. There, look for the Fitbit app and install it. If you have done this and it won't work, are you getting some sort of error message? If so, what does it say?
Let me know if you have any further questions.
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