SCCM 1610, We are able to push client package to the system and its showing with question mark but device is showing as active as below screen shoot for reference.
Step 1: Make sure client has proper boundary settings.
Step 2: By seeing client logs you can see client has successfully register ClientIDManageStartup.log, CCMMessaging, LocationServices.log, etc).
Step 3: All are set correctly as needed so We have resolve issue by Right click on client > and click on approve . find the below screen shot for reference.
For reference Click Here
Email: firstname.lastname@example.org, email@example.com
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