diff --git a/srsgnb/hdr/stack/ric/e2ap.h b/srsgnb/hdr/stack/ric/e2ap.h
index 83074787b..d38b0474d 100644
--- a/srsgnb/hdr/stack/ric/e2ap.h
+++ b/srsgnb/hdr/stack/ric/e2ap.h
@@ -52,7 +52,7 @@ public:
   int         process_setup_failure();
   int         process_subscription_request(ricsubscription_request_s subscription_request);
   e2_ap_pdu_c generate_subscription_response(ric_subscription_reponse_t ric_subscription_reponse);
-  int         generate_subscription_failure();
+  e2_ap_pdu_c generate_subscription_failure(ric_subscription_reponse_t ric_subscription_reponse);
   e2_ap_pdu_c
   generate_subscription_delete_response(uint32_t ric_requestor_id, uint32_t ric_instance_id, uint32_t ra_nfunction_id);
   e2_ap_pdu_c generate_indication(ric_indication_t& ric_indication);
diff --git a/srsgnb/hdr/stack/ric/ric_subscription.h b/srsgnb/hdr/stack/ric/ric_subscription.h
index 49b3ea6c0..a9bd4bf35 100644
--- a/srsgnb/hdr/stack/ric/ric_subscription.h
+++ b/srsgnb/hdr/stack/ric/ric_subscription.h
@@ -30,14 +30,17 @@ public:
 
   uint32_t get_ric_requestor_id() { return ric_requestor_id; };
   uint32_t get_ric_instance_id() { return ric_instance_id; };
+  bool     is_initialized() { return initialized; };
 
   void start_subscription();
+  void send_subscription_failure();
   void delete_subscription();
 
 private:
   void send_ric_indication();
 
-  ric_client* parent = nullptr;
+  ric_client* parent      = nullptr;
+  bool        initialized = false;
 
   uint32_t ric_requestor_id;
   uint32_t ric_instance_id;
diff --git a/srsgnb/src/stack/ric/e2ap.cc b/srsgnb/src/stack/ric/e2ap.cc
index 7f3e0b723..6cd388d4b 100644
--- a/srsgnb/src/stack/ric/e2ap.cc
+++ b/srsgnb/src/stack/ric/e2ap.cc
@@ -115,6 +115,29 @@ e2_ap_pdu_c e2ap::generate_subscription_response(ric_subscription_reponse_t ric_
   return pdu;
 }
 
+e2_ap_pdu_c e2ap::generate_subscription_failure(ric_subscription_reponse_t ric_subscription_reponse)
+{
+  e2_ap_pdu_c             pdu;
+  unsuccessful_outcome_s& failure = pdu.set_unsuccessful_outcome();
+  failure.load_info_obj(ASN1_E2AP_ID_RICSUBSCRIPTION);
+  failure.crit                     = asn1::crit_opts::reject;
+  ricsubscription_fail_s& sub_resp = failure.value.ricsubscription_fail();
+
+  sub_resp->ri_crequest_id.crit                   = asn1::crit_opts::reject;
+  sub_resp->ri_crequest_id.id                     = ASN1_E2AP_ID_RI_CREQUEST_ID;
+  sub_resp->ri_crequest_id.value.ric_requestor_id = ric_subscription_reponse.ric_requestor_id;
+  sub_resp->ri_crequest_id.value.ric_instance_id  = ric_subscription_reponse.ric_instance_id;
+
+  sub_resp->ra_nfunction_id.crit   = asn1::crit_opts::reject;
+  sub_resp->ra_nfunction_id.id     = ASN1_E2AP_ID_RA_NFUNCTION_ID;
+  sub_resp->ra_nfunction_id->value = ric_subscription_reponse.ra_nfunction_id;
+
+  sub_resp->cause->set_misc(); // TODO: set the cause and crit_diagnostics properly
+  sub_resp->crit_diagnostics_present = false;
+
+  return pdu;
+}
+
 e2_ap_pdu_c e2ap::generate_subscription_delete_response(uint32_t ric_requestor_id,
                                                         uint32_t ric_instance_id,
                                                         uint32_t ra_nfunction_id)
diff --git a/srsgnb/src/stack/ric/ric_client.cc b/srsgnb/src/stack/ric/ric_client.cc
index 8765d0111..b0a5de1db 100644
--- a/srsgnb/src/stack/ric/ric_client.cc
+++ b/srsgnb/src/stack/ric/ric_client.cc
@@ -272,8 +272,15 @@ bool ric_client::handle_ric_subscription_request(ricsubscription_request_s ric_s
 
   std::unique_ptr<ric_client::ric_subscription> new_ric_subs =
       std::make_unique<ric_client::ric_subscription>(this, ric_subscription_request);
-  new_ric_subs->start_subscription();
-  active_subscriptions.push_back(std::move(new_ric_subs));
+
+  if (new_ric_subs->is_initialized()) {
+    new_ric_subs->start_subscription();
+    active_subscriptions.push_back(std::move(new_ric_subs));
+  } else {
+    new_ric_subs->send_subscription_failure();
+    return false;
+  }
+
   return true;
 }
 
diff --git a/srsgnb/src/stack/ric/ric_subscription.cc b/srsgnb/src/stack/ric/ric_subscription.cc
index 7cc1eb250..7d19b4eb4 100644
--- a/srsgnb/src/stack/ric/ric_subscription.cc
+++ b/srsgnb/src/stack/ric/ric_subscription.cc
@@ -18,6 +18,7 @@ namespace srsenb {
 ric_client::ric_subscription::ric_subscription(ric_client*               ric_client,
                                                ricsubscription_request_s ric_subscription_request) :
   parent(ric_client),
+  initialized(false),
   ric_requestor_id(ric_subscription_request->ri_crequest_id->ric_requestor_id),
   ric_instance_id(ric_subscription_request->ri_crequest_id->ric_instance_id),
   ra_nfunction_id(ric_subscription_request->ra_nfunction_id->value),
@@ -77,6 +78,7 @@ ric_client::ric_subscription::ric_subscription(ric_client*               ric_cli
       not_admitted_actions.push_back(action_item.ric_action_id);
     }
   }
+  initialized = true;
 }
 
 void ric_client::ric_subscription::start_subscription()
@@ -106,6 +108,18 @@ void ric_client::ric_subscription::start_subscription()
   }
 }
 
+void ric_client::ric_subscription::send_subscription_failure()
+{
+  parent->logger.debug("Send RIC Subscription Failure Response to RIC Requestor ID: %i\n", ric_requestor_id);
+  ric_subscription_reponse_t ric_subscription_reponse;
+  ric_subscription_reponse.ric_requestor_id = ric_requestor_id;
+  ric_subscription_reponse.ric_instance_id  = ric_instance_id;
+  ric_subscription_reponse.ra_nfunction_id  = ra_nfunction_id;
+
+  e2_ap_pdu_c send_pdu = parent->e2ap_.generate_subscription_failure(ric_subscription_reponse);
+  parent->queue_send_e2ap_pdu(send_pdu);
+}
+
 void ric_client::ric_subscription::delete_subscription()
 {
   if (reporting_timer.is_running()) {