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Why this issue is happening
For one or more products, the promotion effective date [promotion_effective_dates] and [promotion_display_dates] attribute shows expired. This error occurs because of its past expiration date.
How to fix your issue
The attribute involved in this is [promotion_effective_dates] and promotion display dates [promotion_display_dates]. You can’t extend the end date of a promotion that has already expired. You can create a new promotion similar to the expired promotion.