I am reaching out regarding an issue I encountered while using Marketing API to create campaigns, ad sets, and ads. I am unable to identify the cause. I successfully created a campaign via the API, followed by an ad set and an ad. The delivery status appeared fine throughout the setup process. However, when the campaign was scheduled to run, the ad's delivery status changed from "Processing" to "Delivery error," displaying the following message: "Validation Error: A validation error occurred. ( #1346001)".

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