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I saw that others were having issues and I figured I would say what I did to do the quest because I didn't find the answer anywhere else.
All you have to do is get the final code, and use it from your inventory, then click the mana bomb. Don't just click the mana bomb itself.
maybe you can share that workaround on comment section here: https://www.warmane.com/bugtracker/report/90892
Also, according this report flagged as "fixed" https://www.warmane.com/bugtracker/report/81890 it should be possible to send a PM to "PencilPusher" to explain him the current issue with that quest but it shows "July 29, 2020" as last log-in ...