docs(srv): add troubleshooting on testing private resources MTA-5424

Author: SamyOubouaziz

serverless/functions/troubleshooting/tests-fail-on-private-function.mdx

@@ -0,0 +1,30 @@
+---
+meta:
+  title: Tests fail on private Serverless Functions
+  description: I get error messages when testing private Serverless Functions using the Scaleway Console
+content:
+  h1: Tests fail on private Serverless Functions
+  paragraph: I get error messages when testing private Serverless Functions using the Scaleway Console
+tags: serverless functions private troubleshooting issue error test authentication token unable
+dates:
+  validation: 2025-01-14
+  posted: 2024-01-14
+categories:
+  - serverless
+---
+
+## Problem
+
+I get error messages when testing private Serverless Functions using the Scaleway Console.
+
+### Cause
+
+This issue can happen for the following reasons:
+
+- You have created too many Serverless Functions namespaces and reached [your account's quota](/identity-and-access-management/organizations-and-projects/additional-content/organization-quotas/#serverless-functions).
+
+- You have created too many Registry namespaces and reached [your account's quota](/identity-and-access-management/organizations-and-projects/additional-content/organization-quotas/#container-registry).
+
+### Possible solutions
+
+Make sure that you have not exceeded the maximum number of allowed namespaces with the [Scaleway console](https://console.scaleway.com/) or with the [API](https://www.scaleway.com/en/developers/api/serverless-functions/#path-namespaces-list-all-your-namespaces).