One of our Entry Events in Marketing Cloud Journey Builder stopped admitting contacts. It uses a Data Extension to get the contacts. The issue was discovered on September 17, 2026, but the last contact entered the journey on June 2, 2026. Since then, over 6,000 new records in Salesforce that should have entered the journey have not been admitted. The Entry Event stopped working exactly 365 days after the Data Extension was created (6/3/25), which may indicate an expiration or configuration issue. No errors are reported; contacts are just not entering as expected.
Other aspects of our Marketing Cloud seem to be fine, including many 1-off sends.
Any suggestions?
#Marketing Cloud #Journey Builder
A 365-day clock in Marketing Cloud almost always means a data retention policy, and retention is configured on the data extension and counts from creation.
Open the DE properties and look at Data Retention Policy. If it is set to a period after creation rather than a rolling window on individual records, everything in it cleared on the anniversary. A Data Extension entry source with nothing in it admits nobody and logs no error, which matches what you are seeing.
The other candidate is whatever populates the DE. If an Automation Studio schedule fills it, check that schedule's end date and last run time. Recurring schedules take an end date and a year out is a common default nobody revisits.
Those 6,000 records are in Salesforce, not necessarily in the DE. Check the DE row count before assuming the journey is at fault.