In order to get the third display connected you'll need an additional GPU. You cannot use 3 external displays natively with this computer. The laptop supports using the internal display while using up to 2 external monitors on any combination of those 3 display output ports. However, and this is the cause of your problems, the laptop does not support using all of the display outputs at the same time.
It features 2 x Thunderbolt 2 ports, which can be used as display outputs, and a single HDMI port which can also be used as a display output. Your laptop features the more recent Thunderbolt 2 standard. The dock itself does not contain a GPU (graphics processing unit) - it merely forwards on the signal from the laptop's own GPU taking up two Thunderbolt ports on the laptop. This allows you to connect 2 displays to the dock. Your dock is a Thunderbolt (the first version) dock that features an HDMI display connector on the right-hand side and a Mini DisplayPort display connector on the left-hand side.
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