AFter upgrading to 2103 all clients have ? next to their name

Wendy Henstock (MEA) 1 Reputation point

AFter upgrading to 2103 all devices have ? next to the name. I have tried uninstalling the client still does not make any difference.

Microsoft Configuration Manager
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  1. AllenLiu-MSFT 42,031 Reputation points Microsoft Vendor

    Hi, @Wendy Henstock (MEA)

    Thank you for posting in Microsoft Q&A forum.

    The "?" means sccm client online status is unknown, the site server (or MP) is not able to connect to the client via the fast channel. There could be several reasons for unknown status, the communication between client and server are not in place.
    Here is the article to troubleshoot SCCM fast channel push notification issues, you may check it to see if it helps:
    (Please Note: Since the website is not hosted by Microsoft, just for your reference.)

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