Thanks for the feedback – updating status to Noted. See https://blogs.technet.microsoft.com/configmgreng/2016/03/11/configmrguv/
An error occurred while saving the commentAl Schneiter commented
and to get a Deadline in Tasksequences...
282 votesstarted · Admindjam (Product Director, or Executive, Microsoft Endpoint Configuration Manager) responded
This can be done today w/ #SCCM 1802 (and previous versions too). I will mark started… and watch comments for why this doesn’t just work… before I mark this straight up completed…
1) On the CAS (or standalone primary), go to Administration → Hierarchy Configuration → Discovery methods
2) right click on Active Directory System Discovery and bring up the Properties form. Active Directory Attributes tab, and then click on Custom. In the form that appears, type the name of the attribute. Click OK, and make sure you have added it as an attribute to discover. Run discovery after exiting properties form.
3) Now when you go to the Devices view and right click on a device and go to its Properties form, you will see the new attribute showing up there.