microsoft/semantic-kernel · error · NotSupportedException

AI embeddings service '{config.Rag.AIEmbeddingService}' is n

Error message

AI embeddings service '{config.Rag.AIEmbeddingService}' is not supported.

What it means

Error "AI embeddings service '{config.Rag.AIEmbeddingService}' is not supported." thrown in microsoft/semantic-kernel.

Source

Thrown at dotnet/samples/Demos/AgentFrameworkWithAspire/ChatWithAgent.ApiService/Program.cs:150

            default:
                throw new NotSupportedException($"AI chat service '{config.AIChatService}' is not supported.");
        }

        // Add text embedding generation services.
        switch (config.Rag.AIEmbeddingService)
        {
            case AzureOpenAIEmbeddingsConfig.ConfigSectionName:
            {
                builder.Services.AddAzureOpenAIEmbeddingGenerator(config.AzureOpenAIEmbeddings.DeploymentName, modelId: config.AzureOpenAIEmbeddings.ModelName);
                break;
            }
            case OpenAIEmbeddingsConfig.ConfigSectionName:
            {
                builder.Services.AddOpenAIEmbeddingGenerator(config.OpenAIEmbeddings.ModelName);
                break;
            }
            default:
                throw new NotSupportedException($"AI embeddings service '{config.Rag.AIEmbeddingService}' is not supported.");
        }
    }

    /// <summary>
    /// Adds the vector store to the service collection.
    /// </summary>
    /// <param name="builder">The web application builder.</param>
    /// <param name="config">The host configuration.</param>
    private static void AddVectorStore(WebApplicationBuilder builder, HostConfig config)
    {
        // Don't add vector store if no collection name is provided. Allows for a basic experience where no data has been uploaded to the vector store yet.
        if (string.IsNullOrWhiteSpace(config.Rag.CollectionName))
        {
            return;
        }

        // Add Vector Store
        switch (config.Rag.VectorStoreType)

View on GitHub (pinned to c028a0c7dc)

Solutions

1. Set Rag:AIEmbeddingService to a supported embeddings provider value in configuration.
2. Review Program.cs for the supported embedding service names and update appsettings.json accordingly.

When it happens

Trigger: Thrown at dotnet/samples/Demos/AgentFrameworkWithAspire/ChatWithAgent.ApiService/Program.cs:150 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of microsoft/semantic-kernel@c028a0c7dc (2026-08-13). Data as JSON: /api/errors/3d2d68f33c3242ff. Report an issue: GitHub.