Outlook Office 365 Shared Calendar

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Hi all,

 

Have setup a shared calendar in Office365 for certain staff. One user uses Outlook 2016 and the shared calendar name shows under Calendars, but when they try to tick the box where it shows the calendar name nothing happens. The box will not tick.

 

I just wondered if this could be because nothing has been put in the calendar yet such as I meeting ?

 

Thanks all