Used PC - Reinstallation of Windows prompts for login using prior owner's MS Credentials

I recently purchased a refurbished Dell Precision from eBay, from a reputable reseller. The PC showed up, and upon power-up, booted into a generic Windows 10 Pro cloned installation (most likely something this reseller just clones onto drives as it ships PCs out the door). I'm not a fan of using these configurations, as who knows what is lurking around on the installation. It's also installed on a slower spinning platter drive, and the computer supports an M.2 NVMe SSD, so you can already guess where I'm headed.

I downloaded the OS recovery stick from Dell Support, and learn the machine originally came with Windows 10 Pro for Workstations. I yanked the spinning drive and installed an M.2 SSD in the machine (incidentally, per Dell's site, the original system configuration included both an M.2 drive AND a spinning drive). Booted the installation stick, and proceeded through the installation. After the first reboot, the machine pops up and wants a network connection. Ok, plug in Ethernet/Internet, and 10 seconds later, Windows greets me with a prompt to sign in with the previous owner's company email (Welcome to !).

I'm assuming the embedded Windows key has been linked to the prior company's Azure AD database, so Windows is trying to authenticate against that and wants to load all the goodies they've configured.

I (obviously) don't want that, and have tried reinstalling using other OS builds, including the generic Windows 10 Pro ISO direct from Microsoft. I even tried the Enterprise build I have from my current employer to see if I could just complete an OS install, but every time, I get stuck at this point.

I have done the Shift-F10 thing to get to a command prompt, invoked powershell, and retrieved the product key, verifying that there is indeed a key embedded in BIOS.

My question(s) to the group:

1) Is there a way to disassociate this embedded product key from the previous company (the previous owner was a larger company, and I doubt my piddly request to them will get answered)?

2) Is there a way to dump the key out of UEFI (or replace it with zeros) so that Windows prompts for a key, so if I purchase a retail copy of Windows 10, I can use that key and complete the installation?

3) Any other suggestions on this particular issue?