Unable to delete character

I want to delete my character but when I tried I got the error that says "Unable to delete character. Return to Standard World and try again. 3115." I think this is an error for when someone tries to delete a character they do not have subscription access too (i.e. two characters in a 1 character per world subscription). However, I only have the one character so regardless of my subscription (which is an entry one), I should be able to delete the character. I would like to remain on the same World and reuse the character name. Does anyone know how to fix this? I've contacted SE support but they have not responded yet.

Is it perhaps to do with where your character is currently located? Did you log out in the overworld or are you somewhere ‘special’ - an inn room or something similar where you won’t meet other characters?