Your issues seems to be different from this thread. The original issue was that a form could not be submitted when required fields were hidden (thus no longer required). Your issue is the opposite where you are hiding required fields, but they still are required. The native form screen wasn’t really designed to handle multiple paging like this. I would recommend creating a custom form instead. It will have the benefit that you can control which fields are required prior to showing a submit button and it has the added bonus that a user can leave the form and come back without having to start over.
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