Thanks for posting!
To clarify, could you specify which HDMI port on the dock that the non-working monitor is connected to? For example, is it the “HDMI 2K” or “HDMI 4K” port?
Given that you’ve already performed our standard driver re-installation process, at this point, I’d like to request some system logs from your computer to best investigate further.
Please keep both HDMI monitors connected to the computer (with one not working), then navigate to our PlugDebug tool and follow the instructions there.
Please send the ZIP file created to us directly at firstname.lastname@example.org and include “Ticket #325113” in the subject line. That’ll help match up the details from this public forum post to the email.
Thanks for giving us the chance to help!