diff --git a/internal/compatibility/proto/request.go b/internal/compatibility/proto/request.go
index 6d07e79a2..20f0b5800 100644
--- a/internal/compatibility/proto/request.go
+++ b/internal/compatibility/proto/request.go
@@ -519,6 +519,7 @@ const (
 	DomainUpdateVisibilityArchivalURIField    = "visibility_archival_uri"
 	DomainUpdateActiveClusterNameField        = "active_cluster_name"
 	DomainUpdateClustersField                 = "clusters"
+	DomainUpdateActiveClustersField           = "active_clusters"
 	DomainUpdateDeleteBadBinaryField          = "delete_bad_binary"
 	DomainUpdateFailoverTimeoutField          = "failover_timeout"
 )
@@ -583,6 +584,10 @@ func UpdateDomainRequest(t *shared.UpdateDomainRequest) *apiv1.UpdateDomainReque
 			request.Clusters = ClusterReplicationConfigurationArray(replicationConfiguration.Clusters)
 			fields = append(fields, DomainUpdateClustersField)
 		}
+		if replicationConfiguration.ActiveClusters != nil {
+			request.ActiveClusters = ActiveClusters(replicationConfiguration.ActiveClusters)
+			fields = append(fields, DomainUpdateActiveClustersField)
+		}
 	}
 	if t.DeleteBadBinary != nil {
 		request.DeleteBadBinary = *t.DeleteBadBinary
diff --git a/internal/compatibility/proto/response.go b/internal/compatibility/proto/response.go
index 776ba843e..8e7e2b927 100644
--- a/internal/compatibility/proto/response.go
+++ b/internal/compatibility/proto/response.go
@@ -62,6 +62,7 @@ func DescribeDomainResponse(t *shared.DescribeDomainResponse) *apiv1.DescribeDom
 	if repl := t.ReplicationConfiguration; repl != nil {
 		domain.ActiveClusterName = repl.GetActiveClusterName()
 		domain.Clusters = ClusterReplicationConfigurationArray(repl.Clusters)
+		domain.ActiveClusters = ActiveClusters(repl.ActiveClusters)
 	}
 	return &apiv1.DescribeDomainResponse{Domain: &domain}
 }
@@ -341,6 +342,7 @@ func UpdateDomainResponse(t *shared.UpdateDomainResponse) *apiv1.UpdateDomainRes
 	if repl := t.ReplicationConfiguration; repl != nil {
 		domain.ActiveClusterName = repl.GetActiveClusterName()
 		domain.Clusters = ClusterReplicationConfigurationArray(repl.Clusters)
+		domain.ActiveClusters = ActiveClusters(repl.ActiveClusters)
 	}
 	return &apiv1.UpdateDomainResponse{
 		Domain: domain,
diff --git a/internal/compatibility/proto/types.go b/internal/compatibility/proto/types.go
index 9cdb9b779..a64d92a94 100644
--- a/internal/compatibility/proto/types.go
+++ b/internal/compatibility/proto/types.go
@@ -552,6 +552,7 @@ func DescribeDomainResponseDomain(t *shared.DescribeDomainResponse) *apiv1.Domai
 	if repl := t.ReplicationConfiguration; repl != nil {
 		domain.ActiveClusterName = repl.GetActiveClusterName()
 		domain.Clusters = ClusterReplicationConfigurationArray(repl.Clusters)
+		domain.ActiveClusters = ActiveClusters(repl.ActiveClusters)
 	}
 	return &domain
 }
@@ -695,3 +696,21 @@ func ActivityLocalDispatchInfoMap(t map[string]*shared.ActivityLocalDispatchInfo
 	}
 	return v
 }
+
+func ActiveClusters(ac *shared.ActiveClusters) *apiv1.ActiveClusters {
+	if ac == nil {
+		return nil
+	}
+
+	regToCl := make(map[string]*apiv1.ActiveClusterInfo)
+	for reg, clusterInfo := range ac.ActiveClustersByRegion {
+		regToCl[reg] = &apiv1.ActiveClusterInfo{
+			ActiveClusterName: clusterInfo.GetActiveClusterName(),
+			FailoverVersion:   clusterInfo.GetFailoverVersion(),
+		}
+	}
+
+	return &apiv1.ActiveClusters{
+		RegionToCluster: regToCl,
+	}
+}
diff --git a/internal/compatibility/testdata/domain.go b/internal/compatibility/testdata/domain.go
index 80a40e99a..20dbf42d1 100644
--- a/internal/compatibility/testdata/domain.go
+++ b/internal/compatibility/testdata/domain.go
@@ -81,6 +81,7 @@ var (
 		VisibilityArchivalUri:            VisibilityArchivalURI,
 		ActiveClusterName:                ClusterName1,
 		Clusters:                         ClusterReplicationConfigurationArray,
+		ActiveClusters:                   ActiveClusters,
 	}
 	ClusterReplicationConfiguration = apiv1.ClusterReplicationConfiguration{
 		ClusterName: ClusterName1,
@@ -92,4 +93,16 @@ var (
 		"Region1": ClusterName1,
 		"Region2": ClusterName2,
 	}
+	ActiveClusters = &apiv1.ActiveClusters{
+		RegionToCluster: map[string]*apiv1.ActiveClusterInfo{
+			"Region1": &apiv1.ActiveClusterInfo{
+				ActiveClusterName: ClusterName1,
+				FailoverVersion:   0,
+			},
+			"Region2": &apiv1.ActiveClusterInfo{
+				ActiveClusterName: ClusterName2,
+				FailoverVersion:   0,
+			},
+		},
+	}
 )
diff --git a/internal/compatibility/testdata/service.go b/internal/compatibility/testdata/service.go
index 4d6379ba2..599de45bf 100644
--- a/internal/compatibility/testdata/service.go
+++ b/internal/compatibility/testdata/service.go
@@ -72,11 +72,29 @@ var (
 		VisibilityArchivalStatus:         ArchivalStatus,
 		VisibilityArchivalUri:            VisibilityArchivalURI,
 		ActiveClusterName:                ClusterName1,
+		ActiveClusters:                   ActiveClusters,
 		Clusters:                         ClusterReplicationConfigurationArray,
 		SecurityToken:                    SecurityToken,
 		DeleteBadBinary:                  DeleteBadBinary,
 		FailoverTimeout:                  Duration1,
-		UpdateMask:                       &gogo.FieldMask{Paths: []string{"description", "owner_email", "data", "workflow_execution_retention_period", "bad_binaries", "history_archival_status", "history_archival_uri", "visibility_archival_status", "visibility_archival_uri", "active_cluster_name", "clusters", "delete_bad_binary", "failover_timeout"}},
+		UpdateMask: &gogo.FieldMask{
+			Paths: []string{
+				"description",
+				"owner_email",
+				"data",
+				"workflow_execution_retention_period",
+				"bad_binaries",
+				"history_archival_status",
+				"history_archival_uri",
+				"visibility_archival_status",
+				"visibility_archival_uri",
+				"active_cluster_name",
+				"clusters",
+				"active_clusters",
+				"delete_bad_binary",
+				"failover_timeout",
+			},
+		},
 	}
 	UpdateDomainResponse = apiv1.UpdateDomainResponse{
 		Domain: &Domain,
diff --git a/internal/compatibility/thrift/request.go b/internal/compatibility/thrift/request.go
index 4ba9932f8..bea585712 100644
--- a/internal/compatibility/thrift/request.go
+++ b/internal/compatibility/thrift/request.go
@@ -509,6 +509,7 @@ const (
 	DomainUpdateVisibilityArchivalURIField    = "visibility_archival_uri"
 	DomainUpdateActiveClusterNameField        = "active_cluster_name"
 	DomainUpdateClustersField                 = "clusters"
+	DomainUpdateActiveClustersField           = "active_clusters"
 	DomainUpdateDeleteBadBinaryField          = "delete_bad_binary"
 	DomainUpdateFailoverTimeoutField          = "failover_timeout"
 )
@@ -556,6 +557,9 @@ func UpdateDomainRequest(t *apiv1.UpdateDomainRequest) *shared.UpdateDomainReque
 	if fs.isSet(DomainUpdateActiveClusterNameField) {
 		request.ReplicationConfiguration.ActiveClusterName = &t.ActiveClusterName
 	}
+	if fs.isSet(DomainUpdateActiveClustersField) {
+		request.ReplicationConfiguration.ActiveClusters = ActiveClusters(t.ActiveClusters)
+	}
 	if fs.isSet(DomainUpdateClustersField) {
 		request.ReplicationConfiguration.Clusters = ClusterReplicationConfigurationArray(t.Clusters)
 	}
diff --git a/internal/compatibility/thrift/response.go b/internal/compatibility/thrift/response.go
index 558bbb48d..68d4a8434 100644
--- a/internal/compatibility/thrift/response.go
+++ b/internal/compatibility/thrift/response.go
@@ -60,6 +60,7 @@ func DescribeDomainResponse(t *apiv1.DescribeDomainResponse) *shared.DescribeDom
 		ReplicationConfiguration: &shared.DomainReplicationConfiguration{
 			ActiveClusterName: &t.Domain.ActiveClusterName,
 			Clusters:          ClusterReplicationConfigurationArray(t.Domain.Clusters),
+			ActiveClusters:    ActiveClusters(t.Domain.ActiveClusters),
 		},
 		FailoverVersion: &t.Domain.FailoverVersion,
 		IsGlobalDomain:  &t.Domain.IsGlobalDomain,
@@ -353,6 +354,7 @@ func UpdateDomainResponse(t *apiv1.UpdateDomainResponse) *shared.UpdateDomainRes
 		ReplicationConfiguration: &shared.DomainReplicationConfiguration{
 			ActiveClusterName: &t.Domain.ActiveClusterName,
 			Clusters:          ClusterReplicationConfigurationArray(t.Domain.Clusters),
+			ActiveClusters:    ActiveClusters(t.Domain.ActiveClusters),
 		},
 		FailoverVersion: &t.Domain.FailoverVersion,
 		IsGlobalDomain:  &t.Domain.IsGlobalDomain,
diff --git a/internal/compatibility/thrift/types.go b/internal/compatibility/thrift/types.go
index 1dd8ec5b3..6f87e88a1 100644
--- a/internal/compatibility/thrift/types.go
+++ b/internal/compatibility/thrift/types.go
@@ -561,6 +561,7 @@ func DescribeDomainResponseDomain(t *apiv1.Domain) *shared.DescribeDomainRespons
 		ReplicationConfiguration: &shared.DomainReplicationConfiguration{
 			ActiveClusterName: &t.ActiveClusterName,
 			Clusters:          ClusterReplicationConfigurationArray(t.Clusters),
+			ActiveClusters:    ActiveClusters(t.ActiveClusters),
 		},
 		FailoverVersion: &t.FailoverVersion,
 		IsGlobalDomain:  &t.IsGlobalDomain,
@@ -706,3 +707,21 @@ func ActivityLocalDispatchInfoMap(t map[string]*apiv1.ActivityLocalDispatchInfo)
 	}
 	return v
 }
+
+func ActiveClusters(ac *apiv1.ActiveClusters) *shared.ActiveClusters {
+	if ac == nil {
+		return nil
+	}
+
+	clByRegion := make(map[string]*shared.ActiveClusterInfo)
+	for region, clInfo := range ac.RegionToCluster {
+		clByRegion[region] = &shared.ActiveClusterInfo{
+			ActiveClusterName: &clInfo.ActiveClusterName,
+			FailoverVersion:   &clInfo.FailoverVersion,
+		}
+	}
+
+	return &shared.ActiveClusters{
+		ActiveClustersByRegion: clByRegion,
+	}
+}