diff --git a/services/ocm/pkg/config/config.go b/services/ocm/pkg/config/config.go
index 395613590e..27236f18dd 100644
--- a/services/ocm/pkg/config/config.go
+++ b/services/ocm/pkg/config/config.go
@@ -83,10 +83,10 @@ type GRPCConfig struct {
 }
 
 type ScienceMesh struct {
-	Prefix             string `yaml:"prefix" env:"OCM_SCIENCEMESH_PREFIX" desc:"URL path prefix for the ScienceMesh service. Note that the string must not start with '/'." introductionVersion:"1.0.0"`
-	MeshDirectoryURL   string `yaml:"science_mesh_directory_url" env:"OCM_MESH_DIRECTORY_URL" desc:"URL of the mesh directory service." introductionVersion:"1.0.0"`
-	Federations        string `yaml:"federations_file" env:"OCM_FEDERATIONS_FILE" desc:"Path to the JSON file where OCM federations data will be stored." introductionVersion:"3.5.0"`
-	InviteAcceptDialog string `yaml:"invite_accept_dialog" env:"OCM_INVITE_ACCEPT_DIALOG" desc:"/open-cloud-mesh/accept-invite;The frontend URL where to land when receiving an invitation" introductionVersion:"3.5.0"`
+	Prefix               string `yaml:"prefix" env:"OCM_SCIENCEMESH_PREFIX" desc:"URL path prefix for the ScienceMesh service. Note that the string must not start with '/'." introductionVersion:"1.0.0"`
+	MeshDirectoryURL     string `yaml:"science_mesh_directory_url" env:"OCM_MESH_DIRECTORY_URL" desc:"URL of the mesh directory service." introductionVersion:"1.0.0"`
+	DirectoryServiceURLs string `yaml:"directory_service_urls" env:"OCM_DIRECTORY_SERVICE_URLS" desc:"Space delimited URLs of the directory services." introductionVersion:"3.5.0"`
+	InviteAcceptDialog   string `yaml:"invite_accept_dialog" env:"OCM_INVITE_ACCEPT_DIALOG" desc:"/open-cloud-mesh/accept-invite;The frontend URL where to land when receiving an invitation" introductionVersion:"3.5.0"`
 }
 
 type OCMD struct {
diff --git a/services/ocm/pkg/config/defaults/defaultconfig.go b/services/ocm/pkg/config/defaults/defaultconfig.go
index f9d3a80000..0109072962 100644
--- a/services/ocm/pkg/config/defaults/defaultconfig.go
+++ b/services/ocm/pkg/config/defaults/defaultconfig.go
@@ -91,7 +91,6 @@ func DefaultConfig() *config.Config {
 		},
 		ScienceMesh: config.ScienceMesh{
 			Prefix:             "sciencemesh",
-			Federations:        filepath.Join(defaults.BaseConfigPath(), "federations.json"),
 			InviteAcceptDialog: "/open-cloud-mesh/accept-invite",
 		},
 		OCMD: config.OCMD{
diff --git a/services/ocm/pkg/revaconfig/config.go b/services/ocm/pkg/revaconfig/config.go
index a79e735aae..db784883d2 100644
--- a/services/ocm/pkg/revaconfig/config.go
+++ b/services/ocm/pkg/revaconfig/config.go
@@ -71,12 +71,12 @@ func OCMConfigFromStruct(cfg *config.Config, logger log.Logger) map[string]inter
 					},
 				},
 				"sciencemesh": map[string]interface{}{
-					"prefix":             cfg.ScienceMesh.Prefix,
-					"smtp_credentials":   map[string]string{},
-					"gatewaysvc":         cfg.Reva.Address,
-					"mesh_directory_url": cfg.ScienceMesh.MeshDirectoryURL,
-					"federations_file":   cfg.ScienceMesh.Federations,
-					"provider_domain":    providerDomain,
+					"prefix":                 cfg.ScienceMesh.Prefix,
+					"smtp_credentials":       map[string]string{},
+					"gatewaysvc":             cfg.Reva.Address,
+					"mesh_directory_url":     cfg.ScienceMesh.MeshDirectoryURL,
+					"directory_service_urls": cfg.ScienceMesh.DirectoryServiceURLs,
+					"provider_domain":        providerDomain,
 					"events": map[string]interface{}{
 						"natsaddress":          cfg.Events.Endpoint,
 						"natsclusterid":        cfg.Events.Cluster,