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When you try to connect to a remote computer using a client running Windows 10, version 1709 or later, the client may not connect while the Remote Desktop Session Host server reports a message that contains the "Class not registered (0x80040154)" error code.
This issue occurs when the user who's trying to connect has a mandatory user profile. To resolve this issue, install the July 24, 2018-KB4338817 (OS Build 16299.579) Windows 10 update.