Cannot connect 3rd monitor to MacBook Pro with the usb to quad hdmi adapter

I am running a MacBook Pro 2020 13" with the Sonoma 14.4.1 operating system.
All 3 monitors functions well on ports 3 and 4 but none of the monitors will operate on ports 1 and 2. tried swapping out all 3 monitors on the 1 and 2 ports and none will work there. Limiting me to just using 2 ports. All 3 monitors are Acer 27" monitors


Thank you for contacting us and welcome to the Plugable forums. I would be happy to assist further with these issues with the Quad HDMI adapter. If you could, can you message us directly and our contact info can be found in our contact page here:

Please reference ticket# 432816 in your initial message and we’d be glad to assist further.

Plugable Support

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