It has been reported that when adding an enrichment activity after a query activity the following alert activity will fail.
This is a known bug in build 9032 where when a query is done on the delivery table on delivery status then an enrichment activity is added. Whether the enrichment does anything or not, alert activity fails.
Success, without enrichment:
Fail, with enrichment:
Audit logs: Failed to load delivery ID ***** into the cache:…
To resolve the issue, NEO-25157 was created for R&D and the issue has since been fixed in build 9330.