Marketing Cloud Engagement Client Secret Expiration: What It Means and How to Rotate Your API Credentials Before September 30, 2026

Yesterday Salesforce sent an email to all customers titled “Marketing Cloud Engagement Secret Expiration and Time-To-Live (TTL)”. If your Marketing Cloud instance communicates with any external system via API (and most production environments do), this change requires action. All existing client secrets for Marketing Cloud Engagement Installed Packages will expire on September 30, 2026. To …

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