Hi ,
Yes, mangOH will support HL8 and HL7 modules on main socket.
HL8 has two possible use cases:
a. Case 1: If application has 5V supply
Connected 5V supply to USB_VBUS
Set AT+WMUSBVCC=0 (>4.75V for USB connection detect).
b. Case 2: If application has no 5V supply
Connect VBATT to USB_VBUS (mangOH use case)
Set AT+WMUSBVCC=1 (>2.5V for USB connection detect).
So, you need to send AT command to configure unit properly. I am not sure what your module is set to by default, but please try send AT+WMUSBVCC=1 to the module and then plug it into mangOH.
cheers,
Ashish