VXOC Astra-J/GTC

I am in the process of recommissioning my Astra J and decided to try out my OBD2 bluetooth unit with my M072 headunit to see how well it works.
The problem I have is that on first fitment it saw the OBD unit but couldn't connect (wirelessly via bluetooth), then after decided it couldn't see it at all.

The unit works fine with the Torque lite app on my android phone when used in my Volvo so I'm at a loss as to why it won't work with the same app on my android HU in the J.
Is there a setting somewhere I might have missed? Or is it likely my cheap chinese OBD has decided to go fubar on me?

Any suggestions/ideas welcome.

I had similar on my B5754 unit. If I used the android settings menu it wouldn't connect but if I used the bluetooth app to pair it then it worked. this may work with M072

I'll try the other menu and see how it goes. I thought I had but the menus are as clear as mud on the M072 unit, probably missed it lol.
Thanks for the suggestion

Tried all menus and this will not connect at all. Google threw up some info that states many of the OBD gadgets will not work with my headunit.
This is what I have - https://www.ebay.co.uk/itm/New-ELM327-V2...2749.l2649

I think if you change the bluetooth PIN in the phone app settings to the one on your OBD you should be able to connect to it. May have to remove your phone from the menu first though.

Can't remember if I got this working or not it was a few months back.

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(16:th-Jan-2018, 21:28:19)Dave11 Wrote: [ -> ]I think if you change the bluetooth PIN in the phone app settings to the one on your OBD you should be able to connect to it. May have to remove your phone from the menu first though.

Can't remember if I got this working or not it was a few months back.

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I had tried that but with no success.

Weird thing is that it actually started working yesterday just before I took the car in for it's MOT. 
It's all set up now but I'm not exactly sold on it, it doesn't look as if it can read fault codes at all as it didn't on my Volvo S60 either.