I have had SfB installed on a laptop and desktop (both Macs). I recently activated the Skype iOS app on my iPhone. Since doing that, the Meetings section does not show any meetings. Before activating the iPhone, meetings were properly displayed on both laptop and desktop. Now none of the devices show it.
Seems that after installing the SFB on your mobile application it has broken your SFB and Exchange integration which is causing the issue.
On your mobile application in the setting options can you see if you are able to find the request for Exchange credentials? If yes use the exchange credential which you use from E-mails this should fix the issue everywhere.