Investigate mailchimp journey enrollment failure that leads to crash

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Related sentry error:
https://muckrock.sentry.io/issues/7192543092/events/2d9ea6efa58d45a9b0afed13d4b8cd6d/?

Chris Keller on News Nerdery encountered this when upgrading the AP to a premium plan.

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This was encountered during enrollment in an organization plan