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ScyllaDB: Replication factor is 3 but requires 4 for quorum

I have a scyla db with 3 nodes. Replication in my keyspace is the following. {'class': 'NetworkTopologyStrategy', 'datacenter1': '3', 'datacenter2': '3'}

but in 2 of the nodes I'm getting this error :

Could not retrieve CDC streams with timestamp 2024/01/26 13:51:25 upon gossip event. Reason: "Cannot achieve consistency level for cl QUORUM. Requires 4, alive 3". Action: continuin>

why does it require 4 ?? is it needed to be configured in other place ?

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