MLOps - SageMaker Pipeline stalls at approval step

I have deployed the SageMaker pipeline as described in the SageMaker Immersion Day and updated it to the listed workflow. The nonproduction environment deployment works fine, but it never asks for approval to deploy to production. Lab: https://catalog.us-east-1.prod.workshops.aws/workshops/63069e26-921c-4ce1-9cc7-dd882ff62575/en-US/lab6/option1#build-and-trigger-the-pipeline-run What might be causing the issue?