You get Chill Touch automatically when you choose circle of spores so it doesn't appear in the character builder as it's not a choice. Check your character sheet, it should be listed in your spells.
I made a Circle of Spores character and the spell appeared.
The character builder is not making Chill Touch available for Circle of Spore which it gains at 2nd level. The spell description marks it as BH 241.
You get Chill Touch automatically when you choose circle of spores so it doesn't appear in the character builder as it's not a choice. Check your character sheet, it should be listed in your spells.
I made a Circle of Spores character and the spell appeared.
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Thanks, found. Strange that it only behaves that way for the Cantrip and not the other spells (Blindness/Deafness and Gentle Repose)