@ Luna_Lumenia
Hello! I wanted to jump on here, and say a huge thank you for this solution!
I got a new PC recently, and FFXIV not loading on my Discord was driving me crazy like others have said. I could not understand why my old HP OMEN gaming laptop would work fine, and then as soon as I swapped it would not show. Tried every solution, and even had someone on Reddit helping me out, so your post really helped!

Like others, renaming my PC solved the issue.