Symbol of Talos

It was my understanding than an evil aligned cleric would, after reaching level 25, be granted a Symbol of Talos by their Deity. Viconia hit level 25, but received no such boon. Are there other conditions that are necessary?
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Anomen gets different symbols depending on alignment: Talos if he's CN, Helm if he's LN or if he's LG and the player works with the Helm temple in the beholder quest, Lathander if he's LG and the player works with the Lathander temple in the beholder quest.
(It's bad scripting which needs a fix. Non-protagonist clerics shouldn't choose their holy symbol based on the protagonist's choices, and Anomen really should get a unique variant of the Helm symbol anyway.)