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HP ZBook Power G7 Mobile Workstation (10J90AV)

I have a HP ZBook g7 mobile workstation which I have connected to  HP USB-C Dock G5 with two monitors connected.
However I am only getting the correct resolution on one monitor.
I have going gone into HP Computer setup > Advanced > System Options.
and have then set 'Enable High Resolution mode when connected to a USB-C DP a lot mode dock'.
However this does not resolve the issue.

Connect laptop to doc with the USB-c and monitors with the monitor cables. Both monitors work fine when connected individually however once both are connected the resolution goes on one of them.

 

Monitors are iiyama ProLite xU2794QSU 27" VA 100Hz  2560 x 1440

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