diff --git a/.changeset/big-olives-ring.md b/.changeset/big-olives-ring.md
new file mode 100644
index 0000000000..fb3db7ab1f
--- /dev/null
+++ b/.changeset/big-olives-ring.md
@@ -0,0 +1,23 @@
+---
+'@reown/appkit-utils': patch
+'@reown/appkit': patch
+'@reown/appkit-adapter-bitcoin': patch
+'@reown/appkit-adapter-ethers': patch
+'@reown/appkit-adapter-ethers5': patch
+'@reown/appkit-adapter-solana': patch
+'@reown/appkit-adapter-wagmi': patch
+'@reown/appkit-cdn': patch
+'@reown/appkit-cli': patch
+'@reown/appkit-common': patch
+'@reown/appkit-core': patch
+'@reown/appkit-experimental': patch
+'@reown/appkit-polyfills': patch
+'@reown/appkit-scaffold-ui': patch
+'@reown/appkit-siwe': patch
+'@reown/appkit-siwx': patch
+'@reown/appkit-ui': patch
+'@reown/appkit-wallet': patch
+'@reown/appkit-wallet-button': patch
+---
+
+Added an error message for when the user provides an invalid project id.
\ No newline at end of file
diff --git a/packages/appkit-utils/src/ErrorUtil.ts b/packages/appkit-utils/src/ErrorUtil.ts
index 00d9737897..198f0c5c94 100644
--- a/packages/appkit-utils/src/ErrorUtil.ts
+++ b/packages/appkit-utils/src/ErrorUtil.ts
@@ -7,6 +7,10 @@ export const ErrorUtil = {
     JWT_VALIDATION_ERROR: {
       message: 'JWT validation error: JWT Token is not yet valid',
       alertErrorKey: 'JWT_TOKEN_NOT_VALID'
+    },
+    INVALID_KEY: {
+      message: 'Unauthorized: invalid key',
+      alertErrorKey: 'INVALID_PROJECT_ID'
     }
   },
   ALERT_ERRORS: {
@@ -32,6 +36,10 @@ export const ErrorUtil = {
       longMessage:
         'Invalid session found on UniversalProvider - please check your time settings and connect again'
     },
+    INVALID_PROJECT_ID: {
+      shortMessage: 'Invalid App Configuration',
+      longMessage: 'Invalid Project ID - update configuration'
+    },
     PROJECT_ID_NOT_CONFIGURED: {
       shortMessage: 'Project ID Not Configured',
       longMessage: 'Project ID Not Configured - update configuration on cloud.reown.com'
diff --git a/packages/appkit/tests/appkit.test.ts b/packages/appkit/tests/appkit.test.ts
index 6586b7832a..e40a265a0f 100644
--- a/packages/appkit/tests/appkit.test.ts
+++ b/packages/appkit/tests/appkit.test.ts
@@ -1421,6 +1421,11 @@ describe('Base', () => {
           alert: ErrorUtil.ALERT_ERRORS.JWT_TOKEN_NOT_VALID,
           message:
             'WebSocket connection closed abnormally with code: 3000 (JWT validation error: JWT Token is not yet valid:)'
+        },
+        {
+          alert: ErrorUtil.ALERT_ERRORS.INVALID_PROJECT_ID,
+          message:
+            'Uncaught Error: WebSocket connection closed abnormally with code: 3000 (Unauthorized: invalid key)'
         }
       ]