I have had my Fitbit Versa for about ten days, and it has been fine for the most part. I received a Facebook Messenger notification a few days ago from a friend, and I can't seem to clear that specific notification from my Versa screen even though it has been long cleared from my phone. I'm not even sure how to search the forums for this, but I have a Moto G5 Plus, and I haven't really had any problems syncing notifications.
