WinRE Missing Administrator Accounts

Question

I just purchased a Dell OptiPlex 7020 from DellRefurbished and got it upgraded to Windows 10 and I wanted to create a new backup image after I got all of the bloatware and unnecessary apps off of the computer and a few essentials installed. I plan on gifting this computer. Anyways, after getting everything the way I wanted it, I decided to delete a partition (named PS Image) Dell had created as a Factory Reset Image of the PC, which I deemed useless, since he is on Windows 10 and restoring from that image would mean going back to Windows 7 or 8, upgrading Windows 10, and then tweaking and installing everything all over again. I created a new image, using the Windows 7 Backup and Restore Utility. I went to then test this from the Windows Recovery Environment / Advanced Startup Options and found that WinRE, requires me to sign into an Administrator account, but when I get to this screen, I am greeted with the message: "You need to sign in as an administrator to continue, but there aren't any administrator accounts on this PC." I never touched the "WinRE Tools" partition that Dell had created. Is this something to do with upgrading to Windows 10 from Windows 8.1? I have checked and the account from "net user" and it is active and I am able to do anything IN Windows that requires Admin rights. Also, I tried enabling the built-in Admin account from an elevated CMD, but have had no luck. Do I need to delete and re-create the WinRE partition? Also, different issue I have been having is that "Windows Recovery Environment > Advanced Options > System Image Recovery" does not seem to see Recovery Images in partitions that are on the same physical disk as the Recovery Environment partition. Is there a way to make my Recovery Image partition discoverable by WinRE, so it is simple to restore from a separate recovery partition on the same physical disk? I only have 1 drive in this computer and want to make it easy to restore for someone that doesn't know computers well. Also, I have had this same issue with doing similarly on a USB (Creating a bootable Windows 10 USB, partitioning the unused space, and then placing a Windows Image (VHD file) on that partition. Any ideas how to make the recovery process easy, without using 3rd party software? This gift has already put me over budget and I am also a bit OCD and want as close to an out-of-the-box experience, without having to reinstall Windows and all of the programs I added, defragging, etc, etc, etc. Any input would be helpful! Thanks!