Hi there,
Make sure when you are creating a mount point, you need to create the mount point folder from the ‘New Simple Volume Wizard’ in disk management of your windows server, once created, do another quick format again after the first quick format during the wizard creation.
Below threads discusses the same issue and you can try out some troubleshooting steps from this and see if that helps you to sort the Issue.
Mount point icons change https://social.technet.microsoft.com/Forums/ie/en-US/05937cee-be7f-4580-bf39-3efb5137e5f2/mount-point-icons-change?forum=winserverfiles
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