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Why Does Toshiba Hard Drive Not Showing Up On My New Mac?

I just bought a brand new MacBook Pro (2020). When I connect my Toshiba external hard drive to my new MacBook, the light on the hard drive turns on a solid blue, but doesn't show up on my Mac anywhere. It doesn't even show up in disk utility. When I connect my Toshiba hard drive to my old MacBook Pro (2010) running on Yosemite, it works fine and I can do time machine backups. I tried connecting someone else's Toshiba hard drive + cord of the same model to my new MacBook - it also doesn't show up. I checked if the USB adapter I'm using to connect my hard drive to the new Mac is the problem - I tried using it with other USBs, my kindle, and it works fine. I tried reformatting the hard drive on my old MacBook to Mac OS Extended (Journaled) as well as ExFat. It still didn't connect with my new MacBook. Also external disks is checked in finder preferences, so it should show up if connected. I'm not sure what else I can do. Can someone help with this issue?