microsoft/semantic-kernel · error · NotSupportedException

AI chat service '{config.AIChatService}' is not supported.

Error message

AI chat service '{config.AIChatService}' is not supported.

What it means

Error "AI chat service '{config.AIChatService}' is not supported." thrown in microsoft/semantic-kernel.

Source

Thrown at dotnet/samples/Demos/AgentFrameworkWithAspire/ChatWithAgent.ApiService/Program.cs:133

        {
            builder.AddOpenAIClient(HostConfig.OpenAIConnectionStringName);
        }

        // Add chat completion services.
        switch (config.AIChatService)
        {
            case AzureOpenAIChatConfig.ConfigSectionName:
            {
                builder.Services.AddAzureOpenAIChatCompletion(config.AzureOpenAIChat.DeploymentName, modelId: config.AzureOpenAIChat.ModelName);
                break;
            }
            case OpenAIChatConfig.ConfigSectionName:
            {
                builder.Services.AddOpenAIChatCompletion(config.OpenAIChat.ModelName);
                break;
            }
            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.");
        }

View on GitHub (pinned to c028a0c7dc)

Solutions

1. Set AIChatService to one of the supported values in configuration (see Program.cs for accepted names such as OpenAI/AzureOpenAI).
2. Correct the AIChatService value in appsettings.json to a supported service type.

When it happens

Trigger: Thrown at dotnet/samples/Demos/AgentFrameworkWithAspire/ChatWithAgent.ApiService/Program.cs:133 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/aa3b6452d4f87ea1. Report an issue: GitHub.