Update instructions to contact support

Author: maud-lv

articles/partner-solutions/split-experimentation/troubleshoot.md

@@ -97,7 +97,7 @@ When creating metrics, creating experiments, or getting experiment results, data
 - Example error message:
   - An unknown error occurred.
 
-- There is an unknown server error. [Contact support](#getting-support).
+- There is an unknown server error. [Open a support ticket](https://azure.microsoft.com/support/create-ticket/).
 
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