Parallels can't find installed, working W10 Boot Camp partition

I have scoured posts, forums, and discussions and can't find a solution to this. Many similar issues, but nothing that solves my problem.

I purchased a new, 2019 MBP and immediately installed W10 through Boot Camp after doing the initial setup of the MacOS. Later, I purchased Parallels and attempted to put my installed W10 Boot Camp partition in there using the directions listed here: https://kb.parallels.com/112941. My Boot Camp partition is not found when viewing Configuration > Hardware > Hard Disk 1 > Source.

Looking in DiskUtil, I have two internal partitions (both on the same SSD): 'Macintosh HD' and 'BOOTCAMP'. The Boot Camp partition is grayed out, likely due to it being unmounted. Right-clicking the name and choosing 'mount' has no response. Selecting the 'Mount' icon right below the Disk Utility header also does nothing. Trying to mount from terminal using 'sudo diskutil mount /dev/disk0s3' responds with 'Volume on disk0s3 failed to mount. If the volume is damaged, try the "readOnly" option."

Any ideas of where to go from here? I've seen many posts about Paragon and similar tools; I do not and have not had these installed. Thanks in advance.