Make sure you have read through this document and understood how Replication CRs are created. See Understanding Replication CR Workflow for more details.
Creating a Replication CR triggers Replication Plug-in for Containers to create a LocalVolume and a RemoteVolume CR. These CRs are used to gather information about the primary and secondary sites storage volumes.
When the status of Replication CR does not change to an expected status, then run the kubectl describe command for the event log.
If an error message is shown in the newest event log, follow the instructions of the error message to fix the problem. Also, check the event logs for the LocalVolume and RemoteVolume CRs in the primary and secondary sites.