diff --git a/native/android/app/CMakeLists.txt b/native/android/app/CMakeLists.txt
--- a/native/android/app/CMakeLists.txt
+++ b/native/android/app/CMakeLists.txt
@@ -132,6 +132,7 @@
 list(APPEND RUST_NATIVE_CODE
   "../../native_rust_library/RustCallback.cpp"
   "../../native_rust_library/RustAESCrypto.cpp"
+  "../../native_rust_library/RustCSAMetadataEmitter.cpp"
 )
 file(GLOB CRYPTO_NATIVE_CODE "../../cpp/CommonCpp/CryptoTools/*.cpp")
 file(GLOB DB_NATIVE_CODE "../../cpp/CommonCpp/DatabaseManagers/*.cpp")
diff --git a/native/ios/Comm.xcodeproj/project.pbxproj b/native/ios/Comm.xcodeproj/project.pbxproj
--- a/native/ios/Comm.xcodeproj/project.pbxproj
+++ b/native/ios/Comm.xcodeproj/project.pbxproj
@@ -74,6 +74,7 @@
 		CB4821AE27CFB187001AB7E1 /* Tools.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 71BF5B7326B401D300EDE27D /* Tools.cpp */; };
 		CB4821AF27CFB19D001AB7E1 /* PlatformSpecificTools.mm in Sources */ = {isa = PBXBuildFile; fileRef = 71762A74270D8AAE00F565ED /* PlatformSpecificTools.mm */; };
 		CB74AB1C2B2AFF6E00CBB494 /* CommServicesAuthMetadataEmitter.mm in Sources */ = {isa = PBXBuildFile; fileRef = CB74AB1B2B2AFF6E00CBB494 /* CommServicesAuthMetadataEmitter.mm */; };
+		CB74AB202B2B0C0A00CBB494 /* RustCSAMetadataEmitter.cpp in Sources */ = {isa = PBXBuildFile; fileRef = CB74AB1E2B2B0C0900CBB494 /* RustCSAMetadataEmitter.cpp */; };
 		CB7EF17E295C674300B17035 /* CommIOSNotifications.mm in Sources */ = {isa = PBXBuildFile; fileRef = CB7EF17D295C5D1800B17035 /* CommIOSNotifications.mm */; };
 		CB7EF180295C674300B17035 /* CommIOSNotificationsBridgeQueue.mm in Sources */ = {isa = PBXBuildFile; fileRef = CB7EF17B295C580500B17035 /* CommIOSNotificationsBridgeQueue.mm */; };
 		CB90951F29534B32002F2A7F /* CommSecureStore.mm in Sources */ = {isa = PBXBuildFile; fileRef = 71D4D7CB26C50B1000FCDBCD /* CommSecureStore.mm */; };
@@ -263,6 +264,8 @@
 		CB38F2BF286C6C980010535C /* UpdateRelationshipMessageSpec.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = UpdateRelationshipMessageSpec.h; path = PersistentStorageUtilities/MessageOperationsUtilities/MessageSpecs/UpdateRelationshipMessageSpec.h; sourceTree = "<group>"; };
 		CB3C621327CE66540054F24C /* libEXSecureStore.a */ = {isa = PBXFileReference; explicitFileType = archive.ar; path = libEXSecureStore.a; sourceTree = BUILT_PRODUCTS_DIR; };
 		CB74AB1B2B2AFF6E00CBB494 /* CommServicesAuthMetadataEmitter.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; name = CommServicesAuthMetadataEmitter.mm; path = Comm/CommServicesAuthMetadataEmitter.mm; sourceTree = "<group>"; };
+		CB74AB1E2B2B0C0900CBB494 /* RustCSAMetadataEmitter.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = RustCSAMetadataEmitter.cpp; sourceTree = "<group>"; };
+		CB74AB1F2B2B0C0900CBB494 /* RustCSAMetadataEmitter.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = RustCSAMetadataEmitter.h; sourceTree = "<group>"; };
 		CB7EF17B295C580500B17035 /* CommIOSNotificationsBridgeQueue.mm */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.objcpp; name = CommIOSNotificationsBridgeQueue.mm; path = Comm/CommIOSNotifications/CommIOSNotificationsBridgeQueue.mm; sourceTree = "<group>"; };
 		CB7EF17C295C580500B17035 /* CommIOSNotificationsBridgeQueue.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = CommIOSNotificationsBridgeQueue.h; path = Comm/CommIOSNotifications/CommIOSNotificationsBridgeQueue.h; sourceTree = "<group>"; };
 		CB7EF17D295C5D1800B17035 /* CommIOSNotifications.mm */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.objcpp; name = CommIOSNotifications.mm; path = Comm/CommIOSNotifications/CommIOSNotifications.mm; sourceTree = "<group>"; };
@@ -587,6 +590,8 @@
 		8B99AF6B28D50D4800EB5ADB /* native_rust_library */ = {
 			isa = PBXGroup;
 			children = (
+				CB74AB1E2B2B0C0900CBB494 /* RustCSAMetadataEmitter.cpp */,
+				CB74AB1F2B2B0C0900CBB494 /* RustCSAMetadataEmitter.h */,
 				DFD5E7842B052B1400C32B6A /* RustAESCrypto.cpp */,
 				DFD5E7852B052B1400C32B6A /* RustAESCrypto.h */,
 				8B652FA4295EA9F1009F8163 /* RustCallback.h */,
@@ -1079,6 +1084,7 @@
 				8BC9568529FC49B00060AE4A /* JSIRust.cpp in Sources */,
 				8EA59BD92A73DAB000EB4F53 /* rustJSI-generated.cpp in Sources */,
 				CB38B48628771CDD00171182 /* TemporaryMessageStorage.mm in Sources */,
+				CB74AB202B2B0C0A00CBB494 /* RustCSAMetadataEmitter.cpp in Sources */,
 				CB38B48428771CAF00171182 /* EncryptedFileUtils.mm in Sources */,
 				CBFE58292885852B003B94C9 /* ThreadOperations.cpp in Sources */,
 				CB74AB1C2B2AFF6E00CBB494 /* CommServicesAuthMetadataEmitter.mm in Sources */,
diff --git a/native/native_rust_library/RustCSAMetadataEmitter.h b/native/native_rust_library/RustCSAMetadataEmitter.h
new file mode 100644
--- /dev/null
+++ b/native/native_rust_library/RustCSAMetadataEmitter.h
@@ -0,0 +1,9 @@
+#pragma once
+
+#include "cxx.h"
+
+namespace comm {
+
+void sendAuthMetadataToJS(rust::String accessToken, rust::String userID);
+
+} // namespace comm
diff --git a/native/native_rust_library/RustCSAMetadataEmitter.cpp b/native/native_rust_library/RustCSAMetadataEmitter.cpp
new file mode 100644
--- /dev/null
+++ b/native/native_rust_library/RustCSAMetadataEmitter.cpp
@@ -0,0 +1,8 @@
+#include "RustCSAMetadataEmitter.h"
+#include "../cpp/CommonCpp/NativeModules/CommServicesAuthMetadataEmitter.h"
+
+namespace comm {
+void sendAuthMetadataToJS(rust::String accessToken, rust::String userID) {
+  CommServicesAuthMetadataEmitter::sendAuthMetadataToJS(accessToken, userID);
+}
+} // namespace comm
diff --git a/native/native_rust_library/src/lib.rs b/native/native_rust_library/src/lib.rs
--- a/native/native_rust_library/src/lib.rs
+++ b/native/native_rust_library/src/lib.rs
@@ -1,7 +1,9 @@
 use backup::ffi::*;
 use comm_opaque2::client::{Login, Registration};
 use comm_opaque2::grpc::opaque_error_to_grpc_status as handle_error;
-use ffi::{bool_callback, string_callback, void_callback};
+use ffi::{
+  bool_callback, send_auth_metadata_to_js, string_callback, void_callback,
+};
 use grpc_clients::identity::protos::authenticated::{
   OutboundKeyInfo, OutboundKeysForUserRequest, UpdateUserPasswordFinishRequest,
   UpdateUserPasswordStartRequest,
@@ -184,6 +186,19 @@
     ) -> Result<()>;
   }
 
+  // Comm Services Auth Metadata Emission
+  #[namespace = "comm"]
+  unsafe extern "C++" {
+    include!("RustCSAMetadataEmitter.h");
+
+    #[allow(unused)]
+    #[cxx_name = "sendAuthMetadataToJS"]
+    fn send_auth_metadata_to_js(
+      access_token: String,
+      user_id: String,
+    ) -> Result<()>;
+  }
+
   // Backup
   extern "Rust" {
     #[cxx_name = "createBackup"]