diff --git a/packages/auth/src/Auth.ts b/packages/auth/src/Auth.ts
index aa98127d..2f49c3a5 100644
--- a/packages/auth/src/Auth.ts
+++ b/packages/auth/src/Auth.ts
@@ -129,7 +129,8 @@ export class Auth {
               header: {
                 "Authorization": "Bearer " + this.auth.token
               },
-              token: this.auth.token
+              token: this.auth.token,
+              clientId: this.internalConfig.clientId
             });
           } else {
             reject("No keycloak token available");
@@ -146,4 +147,5 @@ export class Auth {
 export interface AuthContext {
   header: any;
   token: string;
+  clientId: string;
 }
diff --git a/packages/sync/src/auth/AuthContextProvider.ts b/packages/sync/src/auth/AuthContextProvider.ts
index 0a71d4db..b1b00b6a 100644
--- a/packages/sync/src/auth/AuthContextProvider.ts
+++ b/packages/sync/src/auth/AuthContextProvider.ts
@@ -4,6 +4,7 @@
 export interface AuthContext {
   header: any;
   token: string;
+  clientId: string;
 }
 
 /**
diff --git a/packages/sync/src/links/WebsocketLink.ts b/packages/sync/src/links/WebsocketLink.ts
index ca332847..b7d5a365 100644
--- a/packages/sync/src/links/WebsocketLink.ts
+++ b/packages/sync/src/links/WebsocketLink.ts
@@ -9,8 +9,8 @@ export const defaultWebSocketLink = (userOptions: DataSyncConfig, config: WebSoc
       // Params that can be used to send authentication token etc.
       connectionParams: async () => {
         if (userOptions.authContextProvider) {
-          const { header } = await userOptions.authContextProvider();
-          return { Authorization: header };
+          const { header, clientId } = await userOptions.authContextProvider();
+          return { ...header, clientId };
         }
       },
       connectionCallback: options.connectionCallback,