Event Seal Scroll Weapon S

hi,

today i got like rewards a weapon seal scroll s from event.

i have a bound demon splinter weapon.
so i tried to use scroll on my weapon at bs in some town (tried in 3 different town) and each time the bug.
they asked me for a s80 scroll for unbound the weapon instead a s ...

so i searched bs of mammon and finally tried on it ... he don't accept the event scroll ...

pls try to solve it or echange the scroll for a s80 ... or pm ig

thx in advance