It looiks like you may be trying to use some non-shareable resource that your host is already using.VBox.log wrote: 00:00:02.654988 VRDP: Statistics created: [full], enabled: 0.
00:00:02.656084 VRDP: VRDP: VD: Frames=10 MinMS=15 MaxMS=300 HistoryMS=2000 VideoMS=300
00:00:02.656166 VRDP: Failed to query a property: 9, rc = VERR_NOT_SUPPORTED
00:00:02.681042 VRDP: TCP server failed to bind to a port: default 3389, range [5970]
00:00:02.681132 VRDP: Failed to start VRDP-IN thread, rc = VERR_NET_ADDRESS_IN_USE
00:00:02.681292 VRDP: TCP server closed.
00:00:02.681904 VRDE: Warning: failed to launch VRDE server (VERR_NET_ADDRESS_IN_USE): VirtualBox Remote Desktop Extension server can't bind to the port(s): 5970
p.s. Please attach log files locally in future, that was after all what you were instructed to do. Offsite links can be suspicious, plus they can go stale: whereas these user conversations are meant to remain for the benefit of future readers.