Accessing the resource ‘\\servername’ has been disallowed

On a remote desktop server I got the message: Accessing the resource ‘\\servername’ has been disallowed when trying to access \\servername from file explorer.

The GPO setting that caused this was:
User Configuration/Administrative Templates/Start Menu and Taskbar/Remove Run menu from Start Menu.

When i disabled this setting the users could access servers from file explorer.

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