TBT4-HUB3C does not support second monitor when sourced with MacAir M1. Both monitors are HP Z27. Hub will support a single monitor, but no signal received at second monitor. Verified that the Plugable charging cable was used to connect to the MacAir. The TBT4 was connected to USb-C ports on the HP Z27-- Debug file was forwarded to Support on 12/13/2021.
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The Apple MacBook Air with an Apple M1 processor is limited to a maximum of one external display via a Thunderbolt connection. Apple speaks specifically to this internal laptop limitation under the ‘Video Support’ section of their product specifications here → https://support.apple.com/kb/SP825?locale=en_US
It is because of this internal laptop limitation that both displays connected to the Plugable TBT4-HUB3C hub are not working. To be clear, this is an internal limitation of the laptop. It is not a limitation of the TBT4-HUB3C hub, and we do our best to call out this Apple M1 limitation in our product listings.
In order to connect two external displays to your MacBook Air with an M1 processor, you will have to use a product based on DisplayLink USB video technology. This is because DisplayLink technology can circumvent the laptop’s internal display limitations (for reference the TBT4-HUB3C does NOT use DisplayLink technology).
An example of a DisplayLink-based Plugable product that provides the ability to connect up to two 4K resolution displays to an Apple M1 Mac is the Plugable USBC-6950U adapter → https://plugable.com/products/usbc-6950u
Please note that you can connect the Plugable USBC-6950U adapter to the Plugable TBT4-HUB3C hub and use both products at the same time.
Please let us know if you have any additional questions, and thank you for giving us the chance to help!
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