Dual monitors not spanning on host

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Dual monitors not spanning on host

After some searching this may not be possible, but here goes as I can't find a clear answer and I am suspecting my hardware my be the issue.

I have a laptop and connect to two monitors, one through the built in HDMI and the second through a USB-C adapter with another HDMI. I want to connect to another computer using 2 monitors, both are using display port.

When I connect my teamviewer window only ever opens on one of my monitors, never able to span both. 

Other users have suggested just switching monitors or opening two sessions, one for each monitor. Switching monitors won't work as I use both when connecting, two sessions works, just a little awkward. 

Wondering if I am setting this up wrong or maybe its the USB C video adapter