[Solved] Replset/Oplog works in Dev but not in Prod

I’m using the same MONGO_URL and MONGO_URL_OPLOG in dev and prod. This works perfectly fine in development, but in production the following error is thrown:

Error: $MONGO_OPLOG_URL must be set to the 'local' database of a Mongo replica set
	    at Error (native)
	    at [object Object]._.extend._startTailing (packages/mongo/oplog_tailing.js:185:13)

Any thoughts?

typo :confused: