Hello Lucas,
For troubleshooting purposes, please, enable tracing of requests sent to Exchange servers, reproduce the issue and send us (support[at]adaxes.com) the log file. For information on how to enable the tracing, have a look at the following help article: https://www.adaxes.com/help/?HowDoI.PerformExchangeTasks.TraceExchangeRequests.html.
Also, please, post here or send us a screenshot of the Office 365 tab in the properties of a user for which the issue occurs. To take the screenshot:
- Launch Adaxes Administration Console.
- In the Console Tree, expand your service node.
- Navigate to and right-click the user.
- In the context menu, click Properties.
- Activate the Office 365 tab.
- Take a screenshot and provide it to us.