I have a vivofit and a Forerunner 220, and have had no trouble before today syncing them with the Garmin Connect app. Since the latest app update, neither one will connect to my phone. I put the 220 in pairing mode, my phone can see it and displays the right passkey, but when it tries to connect, it'll time out. The vivofit just won't connect at all.
I'm running a Moto X, updated firmware for the vivofit and 220. I think it's just the latest app update broke something.