customer.accepts_marketing in notifications

New Member
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Is there some trick to getting {{ customer.accepts_marketing }} woking in the notifications?  whenever i try it I am getting "Liquid error: internal".  What's extremely odd is that while {{ }} works as expected, if I try something that I know doesn't exist like {{ customer.nope }} I receive a blank.  At first I thought it was a data type issue, but {{ customer.has_account }} also works.