I would suggest you check your firewall rule for any explicit rules that you might have created that are preventing a user from granting permission to other users.
This behavior may also occur if all the following conditions are true:
-NetBIOS over TCP/IP is not turned on (enabled) on one or more computers in the workgroup.
-The Computer Browser service is not started or is turned off on one or more computers in the workgroup.
-This behavior may also occur if File and Print Sharing for Microsoft Networks is not installed or is blocked by Windows Firewall.
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