Daisy Chained monitors not extending

Hi there,

I have 2 monitors daisy chained, however I'm not able to extend them.

I have the following setup:

• Dell XPS 13 9370
• Dell Thunderbolt Dock TB16
• 2 monitors Dell P2719H
• 1 monitor Dell U2715H

The connections:

• Dock connected to laptop's Thunderbolt USB-C (on the left side of the laptop)
• 1 monitor P2719H connected through HDMI to the dock
• 1 monitor U2715H connected through DP to the dock (Dock miniDP output -> monitor DP input)
• 1 monitor P2719H connected through DP to the U2715H monitor (U2715H DP out -> P2719H DP in)

To note that: my monitor U2715H has the setting Display > DP 1.2 DISABLED (see image below) and as well I had to lower the resolution to 1920x1080 for everything to work on.

I don't know what am I missing, but I would like to have the daisy chained monitors extended, but I'm not able to do so.

Maybe, my setup is not even correct?! In the end, how do I connect the 3 monitors in extend mode?

Thanks in advance for your help!