msDS-cloudExtensionAttribute1

Hello,

I have a question about the AD attribute "msDS-cloudExtensionAttribute1". 

Which command can I use to fill this attribute with a value in the local AD via Powershell? 

set-aduser -identity Bernd | select msDS-cloudExtensionAttribute1 "xyz" does not work.

And is there a way for all users to copy the content of the "Title" attribute into the "msDS-cloudExtensionAttribute1" attribute? 

Thank you very much for help

Konrad