To enable Exchange Online mailbox and Skype for Business Online in Office 365, you must have the appropriate powers, such as those included in the built-in Manage Policies and Automation Triggers role. Your license must also support the Microsoft Exchange product.
IMPORTANT:Microsoft Server limits the number of concurrent users connected to the WinRM/WinRS session to five and the number of shells per user to five, so ensure that the same user account is limited to five shell for DRA secondary servers.
To enable support for Exchange Online and Skype for Business Online:
If not already installed, install the Microsoft components indicated below:
PowerShell 5.0+
Microsoft Online Services Sign-in Assistant for IT Professionals RTW
https://www.microsoft.com/en-us/download/details.aspx?id=41950
Skype for Business Online, Windows PowerShell Module
https://www.microsoft.com/en-us/download/details.aspx?id=39366
Open PowerShell and run Install-Module MSOnline.
For more information, see https://docs.microsoft.com/en-us/office365/enterprise/powershell/connect-to-office-365-powershell.
Open the Computer Management console and restart the NetIQ Administration Service.
In the left pane, click Policy and Automation Management.
Navigate to Policy and Automation Management > Configure Office 365 Policies, and click Enable Exchange Online Administration support.