What kind of Office 365 scenario do you use? 

  • Pure Office 365 
  • Office 365 with additional on premise services (e.g. AD Sync, Exchange on-premise) 
  • Exchange 2019/2016 

Does the button work for some users or none? 

Are there commonalities of the affected users, e.g.  

  • Location 

  • Network segment 

  • Exchange server (O365 type mailbox or on-premise) 

  • (Local) security policies 

  • AD groups 


What ist the system configuration of the affected users: 

  • Operating system version 

  • Outlook version 

  • Exchange version 

  • Does the button work in Outlook Web Access? 

  • Does the button work in the local desktop client of Outlook? 

  • If an error occurs, what is the error message?

Is the access to the required domains valid? 

Which kind of deployment method did you use?  

  • Installation via Exchange Admin Center, Office 365 Admin Center, or local client?