Hi @Daniel_Camarena and welcome!
Please note that MongoDB Multi-Document Transactions are supported in both replica sets and sharded clusters (sharded cluster consists of replica sets)
This error is likely to be related to sessions. Could you provide:
- The MongoDB driver and version that you use
- A minimal reproducible code to show the transaction operation
- Any error logs happening on the replica set during/around the error that you’ve received.
Regards,
Wan.