Thanks for you comment that was exactly what I was looking for.
I personally was only curious about actual users so I expanded on your group output.

$resourceIdentity = Read-Host
try
{
(Get-CalendarProcessing -Identity $resourceIdentity).Bookinpolicy | Get-user -ErrorAction SilentlyContinue | ft name -AutoSize
}
finally
{
(Get-CalendarProcessing -Identity $resourceIdentity).Bookinpolicy | Get-Group -ErrorAction SilentlyContinue |% {Get-DistributionGroupMember $_.identity}| select name | ft
}

I love that. It gives me just what I need, without chopping it off.

Use this.

((Get-calendarprocessing <>).bookinpolicy | Get-recipient ).PrimarySMTPAddress

Example:

((Get-calendarprocessing H3060@mydomain.com).bookinpolicy | Get-recipient ).PrimarySMTPAddress

Would you like to share the post

Still Not Working

Great you saved my day !
instead of alias I use DisplayName

if you do get-recipient instead of get-mailbox, you can also extract the alias if a group is assigned:

foreach ( $x in (Get-CalendarProcessing “podcast_room_2gp-4” | Select-Object -ExpandProperty:bookinpolicy) ) { get-recipient $x | select -ExpandProperty:alias }

What was the post or command used to get this info?

I am having the same issue with bookinpolicy returning truncated values. When I pipe this to “| Select Name” it returns blank lines.
I checked one of the mailboxes and legacydn property has the same truncated value

I apologize that I wasn’t clear. I’m using Powershell w the Azure AD module loaded (often required for O365) to connect to Exchange Online.