SE2417HG, two, not working on motherboard DP port source

Hello,

I have 2 Dell SE2417HG monitors.  I have used them as dual displays used a video card DVI port to HDMI on the monitors.  I am now attempting to use them with a new PC which has two DP ports on the motherboard (not a card) and using cables DP Source to HDMI Display.  They are not working or even showing up.  I have upgraded the windows 11 drivers from Dell and still no luck.  The motherboard has one HDMI port, however.  When I use the HDMI port to HDMI port on the monitors, it works, but that means I can only use one monitor.  I would appreciate any help you can provide to troubleshoot the issue.