Set-ADUser for attribute that is NULL

How do I run Set-ADUser for a property (msExchRecipientDisplayType) that is currently set to NULL?

Tried this:

$users = Import-Csv -Path .\TestUsers.csv
foreach ($user in $users) {                        
 Get-ADUser -Identity $($user.DN) -Properties msExchRecipientDisplayType -Server Domain.parent.com |            
  Set-ADUser -msExchRecipientDisplayType $($user.Value)
}

My error is:

Set-ADUser : A parameter cannot be found that matches parameter name ‘msExchRecipientDisplayType’.

I thought I would have the parameter in the pipeline to set.

Exchange Active Directory attributes should only be set with Exchange cmdlets.

https://blogs.technet.microsoft.com/johnbai/2013/09/11/o365-exchange-and-ad-how-msexchrecipientdisplaytype-and-msexchangerecipienttypedetails-relate-to-your-on-premises/

http://memphistech.net/exchange-recipient-types-and-office-365-setting-active-directory-attribute-values/

I’m not an Exchange SME, but my guess would be that those values are set when you do something like Enable-Mailbox for a user would associate the attribute with a User Mailbox. To reiterate (also by the first link), Exchange sets those values, they should not be directly modified

this worked:

$users = import-csv 
Foreach ($u in $users) {set-ADUser $u.DN -replace @{msexchrecipientdisplaytype="0"}