Dell Latitude/Win 10 - dual monitors, only one displays

[Jimmy59601]

I'm trying to hook up two monitors to a Dell Latitude 7390 laptop. The laptop has one HDMI and one USB/Thunderbolt port. It does not have a Display Port. I attached one monitor from its HDMI port to the laptop's HDMI port. I attached the other monitor from its DP to the laptop's USB-C/Thunderbolt port using a DP/Thunderbolt adapter cable. Only the latter monitor displays. The HDMI/HDMI monitor does not display, but indicates "searching for display port." Window does not find the monitor when I "Detect."

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