Issue with New_or_Existing_Customer on ScreenFlows - Give Users a Choice

I can't complete the challenge due to an error, as previosly stated in this issue: https://trailhead.salesforce.com/trailblazer-community/feed/0D54V00007Ahn8rSAB

I'm opening a new Issue since the one I'm referencing doesn't have any follow up by the user. The module URL is https://trailhead.salesforce.com/content/learn/modules/screen-flows/give-users-a-choice?trail_id=build-flows-with-flow-builder