That Seagate Backup Plus Hub is stated to be a USB3.0 device. The USB people have re-named that as USB 3.2 Gen1, but that is only a name change - it's still the same. So that unit is not your problem.
Look closely inside the USB type A sockets on you computer case and back panel. The original USB2 connector has four metal contact strips on the surface of the supporting flat plate inside the socket, and you will see the same construction inside the PLUG on the end of a USB2 cable. ALL UAB3.2 Gen (whatever) Type A connector SOCKETS have those same four strips to the surface, PLUS five smaller contact points along the front EDGE of that support piece. The mating PLUGS have their five contacts at the very back of the open space. So that way you can tell which Type A Sockets are on your machine. You should find some are USB3, and the sockets on the Seagate unit also should be.
THEN you need to check the CABLE you are using. Probably the one you use with the Seagate unit has a Type A on one end to plug into the comptuer socket, and a smaller Type B (or another) on the other end to plug into the Seagate unit. Look at the wider Type A Plug on one end. It needs to have both the four strips along the surface AND the five contact points across the BACK of the plug open space. For a USB3 connection to work, the computer socket, the external device, AND the connecting cable all need to be the new USB3 design.
Check also the fit. To make those five contacts work the plug must be able to fit all the way into the socket smoothly.