There are many possible reasons why your listing isn't repricing.

1. Missing repricing rule, Min Price or Max Price.
2. Check repricing rule.
3. Min Price = Max Price.
4. Listings with No Competition won't receive an SQS notification from Amazon.
5. Missing Amazon SQS notification. The listing will have to wait for the 6-hour automatic repricing window.
6. Inactive listings do not reprice.
7. Buy Box setting set to Do Not Change My Buy Box Price.
8. Competitors are below your Min Price. (If the corresponding price adjustment strategy is set for "Do Not Reprice," the listing won't proceed to reprice. )
9. Competitors are above your Max Price. (If the corresponding price adjustment strategy is set for "Do Not Reprice," the listing won't proceed to reprice. )