Hi GiZmo, I had a great Thanksgiving, thanks! Hope you did too!

The versions of OS X I used are High Sierra and Catalina, but I must specify that for this task I'm mainly using Windows 7, either running in dual boot or in a virtual machine. I tried so many times to format floppy disks to 720k in the Command Prompt with the same command you wrote in your post, to no avail (I can successfully format them with the regular Format a: command, but that’s about it). I also tried with Format a: /f:720, but I always get the same error: “Parameters not supported”. Just in case, I installed XP on the virtual machine and tried the same procedure, but still got the same error.
I made sure to put back the piece of black tape to cover the second hole of the floppy disks each time I inserted them into the disk drive of my Amiga, but I’d still get the "DF0:BAD" or "DF0:DOSc" icons. When I saw the "DF0:DOSc" icon I though "Well well, that's an improvement" and immediately launched CrossDOS, but obviously my excitement was short lived when nothing changed after loading Attach.DI0 (Amiga asks me to switch between the Workbench floppy and the CrossDOS one at least 4 times just for completing this task!). Those floppy disks can still be formatted successfully in their original format on the Amiga after covering the second hole, and under Windows with the Format a: command after removing the piece of tape, but that’s all I can do. I cannot format them to 720k, nor can my Amiga read them afterwards. I’m basically stuck.
At this point I believe the culprit is my cheap external Mitsumi USB floppy drive: it's either defective, too new, or incompatible. The reason why I'm saying this is also because while I’m having those problems in Windows, Mac OS doesn’t even recognize this FDD and it doesn’t show up under Disk Utility.
I was watching some old USB floppy drives such as the LACIE Pocket 706018 MyFloppy3 that I read on some forums should do the trick; instead I decided to go ahead and purchase a Gotek drive because I am not willing at the moment to waste more time and money for a device that I don’t even know for sure if it will solve my problem. And believe me, I’m not too happy about this. I was hoping for a more “traditional” (translation: old fashioned) way to transfer adf files from computer to Amiga, but I guess I’ll have to accept this arrangement until the day I’ll be able to find/afford another Amiga 1200.
PS: Wish I could find a purist who hates their Amiga 1200 so much to the point they would trade it for my classic Amiga 500 with original floppy drive, box, internal Gotek drive, UK power supply (that I don't need because I use my US version), and memory expansion included. I would gladly part from it, and even add the original Amiga tank mouse as a gift...I'm sure they would have the experience to enjoy this A500 much more than I do
