Ah it appears that in the provided steam url to ID64 converter website, I had /home at the end. *facepalm* I removed the /home and it worked perfectly! Thank you for the help!
I just joined the website in hopes of playing on the DayZRP servers, but when I completed my whitelist registration form, I received the error message "That PlayerID is already registered with another account!" despite never filling out a form nor being whitelisted on this website before. Any ideas why? Thanks for your time!