HP USB-C G5 Dock/ HP Probook 450 G7 display resolution 3 external monitors

[KristoferPhipps]

I am using an HP Probook 450 G7 that is entirely up to date with all Windows and driver updates. I have an HP USB-C G5 docking station and three Sceptre E248B monitors. Two of these monitors are connected with display cables from the dock to DP1.4 ports on the monitors. The third one is using the HDMI port. I can do a three-monitor setup using the internal display of the probook without issue; however, if I try to extend it to all three external monitors, the third monitor will not allow any other resolution besides 720x480. 

Here are the specifics for each monitor:
External Monitor 1 - HDMI - 1920x1080 59.94Hz refresh

External Monitor 2 - DP1.4 - 1920x1080 59.94Hz refresh

External Monitor 3 - DP1.4 - 720x480 59.94Hz refresh

Internal Display - Disconnected

Alternatively, I can use this, but it defeats the purpose of having three monitors:

Internal Display - 1920x1080 59.94Hz refresh

External Monitor 1 - HDMI - 1920x1080 59.94Hz refresh

External Monitor 2 - DP1.4 - 1920x1080 59.94Hz refresh

External Monitor 3 - Disconnected

(This setup is repeated no matter the configuration of external monitors, i.e., the same would apply if I used the two DP monitors instead of the HDMI monitor.)

I would appreciate any assistance on how to get the third external monitor to have the correct resolution and, if possible, to be able to use the internal display in addition to the three external monitors. 

[banhien]

@KristoferPhipps 

The specs of your machine is

           https://support.hp.com/za-en/document/c06475016

It has  (1) USB 3.1 Type-C Gen 1 connector (Power Delivery, DisplayPort) port which does NOT say the DP version. The dock supports

vv

You should get 3 FHP displays using 2 DP ports and 1 HDMI port on the dock. Is it a G5 model 5TW10AA or a different G5 ?

Regards

[KristoferPhipps]

@Banhien

I have "3 FHP displays using 2 DP ports and 1 HDMI port on the dock." 

The dock is a G5 model 26D32AA.