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Microsoft Windows 11

Hi. I have an HP All-In-One Monitor with the HDMI 1, 2, and 3 in the back. The old AIO monitor I had had an HDMI in and out and the dual monitor system worked perfectly fine. I am trying to connect a 2nd monitor to extend the display on the new AIO computer. I have bought the correct HDMI cords and plugged them correctly, but it does not detect the second monitor. I've tried plugging in to all the 3 ports. I have also tested the second monitor in other computers and it works perfectly fine. I am having issue connecting to the HP AIO only. Any assistance on this? Thank you so much!

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