help with quest The Purification of Quel'Delar.

Hi everyone, maybe its a stupid question or bug, but i can't get a quest item from quest The Purification of Quel'Delar.

if I use my quest item in the fountain in Sunwell, how is it supposed to work, after a while I should take a weapon from the "fountain" but when I click on the weapon I get a blank window (as you can see in the screenshot)

Do you have some advice or im doing something wrong? I had read this quest and watched videos on YT.

https://imgur.com/a/bCLgpKP

You can't do this quest in a raid group.

Hi Shred92, Thank you for your advice. i'm going to try it right away!
-- it works, thank you for your help, I could have thought of it