There are two different Wi-Fi 7 APs in this room.
This AP is broadcasting on multiple channels including 6 GHz.
This AP is broadcasting on multiple channels including 6 GHz.
Take captures of both and compare and contrast the information elements to determine which supports MLO.
The answer is currently only the TP-Link Archer BE550. It is the only AP broadcasting the Multi-Link Element (MLE). This information element indicates support for Multi-Link Operation. \
The UniFi U7 will get MLO support in an upcoming firmware release.