Bah, I hate posting and then saying Nevermind, but I already found some closure.
After multiple attempts on my Linux Desktop, I decided to just get the Certificate data straight out of terminal with the openssl command without the -noout.
Entering this text in the text box (the BEGIN CERTIFICATE / END CERTIFICATE contents) with absolutely no modification worked.
I compared the two entries side by side, and it looks like my Text Editor was still adding markup language. It's a silly thing, but if someone searches for this in the future, all I can say is keep trying to make sure your certificate data is getting imported with absolutely no modification from your text editor.