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Remediation

Enable Multi-AZ Deployment​

Enable Multi-AZ deployment for the affected DMS replication instance.

From Command Line​

Run the following command to enable Multi-AZ deployment:

aws dms modify-replication-instance \
    --replication-instance-arn {{replication-instance-arn}} \
    --multi-az \
    --apply-immediately

Confirm that the replication instance reports MultiAZ as true after the modification completes.