AWS SESV2 Python send_email API Behavior in Sandbox Mode

Hi, I'm following this documentation https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/sesv2/client/send_email.html and I'm trying to send an email to everyone in my contact list this is subscribed to a certain topic. Everyone in this contact list is a verified identity, so I am expecting to be able to email every contact in the list even though I am in sandbox mode. When I do not supply a Destination param to the send_email API and I include ListManagementOptions with the contact list name and topic correctly supplied I get a BadRequestException with an error message of None. This makes it hard to know if I have actually supplied a bad request (and if so what is the error?) or if the behavior I am seeing is due to me being in sandbox mode. Perhaps it is also worth noting when I keep my request the same but add Destination and manually supply all emails in the contact list to the Destination then the send_email API request is successful. Ultimately I hope this is due to being in the sandbox and I don't need to manually parse emails out of the contact list to supply to Destination.