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If I solicited a fee waiver from UVA, and was granted one, but I then forgot to use the code (I applied about an hour-ish ago). is there a way to ask for a refund? And if so, would schools look negatively on it?

I am not sure, but I would first contact LSAC rather than the school - they will be more familiar with their system and there is zero risk of annoying someone with power over your application.