Need help resolving tool_user_error: Error: search_vectorization_error; Azure AI Search was unable to vectorize the search query. () Could not complete vectorization action.

Question

I have already set up access to Azure Storage and deployed two models for this project, but now I'm getting this error when I attempt to make my agent perform RAG operations. Any help would be appreciated

tool_user_error: Error: search_vectorization_error; Azure AI Search was unable to vectorize the search query. () Could not complete vectorization action. The service failed to authenticate to the vectorization endpoint. Code: Message: Could not complete vectorization action. The service failed to authenticate to the vectorization endpoint. RunId: run_c2h7GzbacasJeSBHnXS9tVVm

Answer 1

Hi, Welcome to MS Q&A

The error you’re encountering —

“Could not complete vectorization action. The service failed to authenticate to the vectorization endpoint.” — is typically an authentication/authorization issue between Azure AI Search and the embedding model endpoint (such as Azure OpenAI Service). Here are the key causes and a step-by-step checklist to resolve it.

Common causes & fixes

• The search service’s managed identity or service principal isn’t granted permission to call the embedding model. Microsoft Learn+2Microsoft Learn+2
• API key or endpoint used in the vectorizer configuration is incorrect or missing. Microsoft Learn+2Microsoft Learn+2
• Network restrictions (firewalls/private endpoints) impede the search service from reaching the vectorization endpoint. Microsoft Learn+2Azure Documentation+2
• The vectorizer configuration (in the index definition) is mis-aligned (wrong model name, deployment Id, or version) so the call fails authentication. GitHub+1

Pls check link share above for fix

Thanks

Deepanshu