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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:
https://www.anoopcnair.com/troubleshoot-sccm-fast-channel-push-notification-issues/
(Please Note: Since the website is not hosted by Microsoft, just for your reference.)
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Hi no sorry it is related to Configuration Manager 2103.
Thank you