I had the same problem to reset a T7 touch drive, and I figured out the process successfully. So I'll leave this procedure here for others to find. Obviously, all prior data on the drive will be forever gone with this procedure.
Step 1, you need to contact Samsung support, at their 3rd part support provider, "Total Tech Solutions": https://www.totalts.com/Account/Login?ReturnUrl=%2f
For me, using firefox, this site gave me a dangerous site warning, weird, but it's fine - I had to add an exception. Then scroll down to where you see "live chat". Click on that button (live chat is probably closed, not a problem), and it will instead take you to a page to open a support ticket request (under livehelpnow.net, and should say "samsung memory services" at the top). Fill this in, select your device in the drop down menu, and mention you need to reset your device, and submit.
For me, in 1 day they responded, and first sent me a dropbox link with a .zip that includes a samsung tool with a file "factoryreset.exe". Open the tool, which scans for a locked SSD, and generates a 4-part key, which you reply back to the support email, and they'll give you part 2 of that key to type in to complete the reset. Supposedly this tool works for most, but for me this tool couldn't initially find my drive (said "no locked PSSD found"). I'm using windows, but there is a mac version as well, just note in your message which you need.
So attempt 2, I wrote back, and this time they sent another dropbox for another reset tool that instead uses the PSID number on the end of the SSD housing (also called "factoryreset.exe"). This tool worked great, and more simply. Just enter that PSID (a long string of about 30 letters/numbers), click "do factory reset", and in about a minute, it's all done.
Next, unplug and replug the SSD. The drive won't show up in Windows explorer yet. Open "disk mangement" via the administrative tools --> computer management in the control panel, and you should see your drive as unallocated space. Right click on the small drive label square on the left (not the long rectangle representing the drive partition), and select "initialize drive". Select MBR or GPT (it should be prechecked, based on how your other drives are set up, like in my case it was MBR, but most newer PCs may be GPT). Then click next to finish.
Lastly, now click instead on the unallocated space rectangle to the right, and select "new simple volume", let it provide a drive letter, and hit ok, and that's it. The drive should be reset and good to go.
One warning, while my T7 drive now works great again, this process wiped away the original small read-only partition that contained the samsung software to set up the drive protection password and fingerprint. I don't care or need it personally, but if you do, you may need to ask support yet again for that software or how to replace it onto the drive.
You would think Samsung would utilize a more straightforward way to do all this than a 3rd party support company giving random dropbox links and downloaded exe files, which comes across as super sketchy. It all works, but be sure to follow the contact process here to get the links straight from their tech support, and probably avoid dropbox links found in the wild online to be safe.
