Getting an error setting up an HUS-BZB-1 usb stick for Zigbee

Windows 10 pc has a virtual manager installed. Home Assistant is installed on VM. I have connected Nortek GoControl QuickStick Combo Model HUSBZB-1 (Z-Wave & Zigbee Ember 3581 USB Adapter) to the PC.
Followed instructions as given on this link-
Zigbee Home Automation - Home Assistant (home-assistant.io)
In HA, from integration selected ZHA. Followed steps as listed under “Configurations”. After selecting the radio type, HA asked for the serial device path. Selected the correct one (/dev/ttyUSB1) & clicked submit. No problem Then asked for radio type. Selected EZSP & clicked submit. No problem. Under settings, the serial device path was already selected. Saw “port speed” which by default is 57600 (I cannot change that). Also saw “Data flow control” as software by default (I can change to hardware if required). Then clicked submit. I receive an error message stating “Failed to connect”.
Tried again using hardware under Data flow control but still got the same error.
Any idea?

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