Improve to allow on Prem Mail boxes on Get-DistributionGroupMemberRecursive

[spyram]

You could add in your SWITCH ($Member.RecipientType)...

{($_ -eq "UserMailbox") -or ($_ -eq "Mailuser")} {

To include both cases of Onprem Mailboxes (Mailuser) vs O365 Mailboxes (UserMailbox)

Also you could add a default case for new cases that are not being handled.