When using -showwindow switch with help or get-help for Exchange Online cmdlet, the details of the cmdlet is not displayed.

instruction to connect to EXO is documented below
https://technet.microsoft.com/en-us/library/jj984289(v=exchg.160).aspx

https://technet.microsoft.com/en-us/library/mt775114(v=exchg.160).aspx

for example
get-help Get-MailboxCalendarFolder -showwindow
help Get-MailboxCalendarFolder -showwindow

Get-Help works in cmdlet line as below but -ShowWindow doesn’t show same details in the window

PS C:\Users\user1> get-help Get-MailboxCalendarFolder

NAME
Get-MailboxCalendarFolder

SYNOPSIS
This cmdlet is available in on-premises Exchange Server 2016 and in the cloud-based service. Some parameters and settings may be exclusive to one environment or the other.

Use the Get-MailboxCalendarFolder cmdlet to retrieve the publishing or sharing settings for a specified mailbox calendar folder.

For information about the parameter sets in the Syntax section below, see Exchange cmdlet syntax.

SYNTAX
Get-MailboxCalendarFolder -Identity [-DomainController ] []

DESCRIPTION
The Get-MailboxCalendarFolder cmdlet retrieves information for the specified calendar folder. This information includes the calendar folder name, whether the folder is currently
published or shared, the start and end range of calendar days published, the level of details published for the calendar, whether the published URL of the calendar can be searched on
the web, and the published URL for the calendar.

You need to be assigned permissions before you can run this cmdlet. Although all parameters for this cmdlet are listed in this topic, you may not have access to some parameters if
they're not included in the permissions assigned to you. To see what permissions you need, see the "Calendar configuration" entry in the Recipients Permissions topic.

RELATED LINKS
Online Version http://technet.microsoft.com/EN-US/library/dba2cebb-3c37-40ce-8ac0-93ec8d79ce0d(EXCHG.160).aspx

REMARKS
To see the examples, type: "get-help Get-MailboxCalendarFolder -examples".
For more information, type: "get-help Get-MailboxCalendarFolder -detailed".
For technical information, type: "get-help Get-MailboxCalendarFolder -full".
For online help, type: "get-help Get-MailboxCalendarFolder -online"

Expected behavior

get-help Get-Mailbox -showwindow or help get-mailbox -showwindow cmdlet should show details of the help documentation in the window

Actual behavior

get-help Get-Mailbox -showwindow or help get-mailbox -showwindow cmdlet does not show details of the help documentation in the window. It is blank