Unfortunately, some Office 365 / Exchange accounts will not be able to connect and sync with FullContact. This may be due to one or more of the following reasons:
The administrator for the Exchange account has disabled Exchange Web Services (EWS). EWS is the protocol FullContact uses to sync with Exchange.
The administrator for the Exchange account has not properly configured EWS (or has chosen not to configure it). In the case where the Administrator misconfigured EWS, connecting may still be possible via manual configuration. Please email our Support team - firstname.lastname@example.org - for further instructions.
EWS may be temporarily down for that Exchange account.
The Exchange version is unsupported. FullContact supports versions 2016, 2013, and 2010. At this time, any previous versions are not supported.
The site administrator has placed a firewall (most commonly Microsoft Forefront TMG) in front of Exchange such that it blocks FullContact’s access.