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## Summary Fixes #13483 ### Motivation and Context When `use_vertexai=True`, users authenticate via Application Default Credentials (ADC) and don't need an API key. However, the initialization check for `api_key` runs unconditionally, blocking Vertex AI users with: ``` ServiceInitializationError: The API key is required when use_vertexai is False. ``` ### Description Guard the `api_key` validation with `not google_ai_settings.use_vertexai` in all three Google AI service classes: - `GoogleAIChatCompletion` - `GoogleAITextCompletion` - `GoogleAITextEmbedding` The error message already reads *"when use_vertexai is False"*, so the condition now matches the intent. ### Before / After ```python # Before — fails even with use_vertexai=True GoogleAIChatCompletion( use_vertexai=True, cloud_project_id="my-project", cloud_region="us-central1" ) # → ServiceInitializationError: The API key is required when use_vertexai is False. # After — works correctly GoogleAIChatCompletion( use_vertexai=True, cloud_project_id="my-project", cloud_region="us-central1" ) # → Initializes successfully, uses ADC for authentication ``` ### Contribution Checklist - [x] The code builds clean without any errors or warnings - [x] The PR follows the [SK Contribution Guidelines](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md) - [x] The code follows the [SK coding standards](https://github.com/microsoft/semantic-kernel/blob/main/python/README.md) --------- Co-authored-by: giulio-leone <giulio.leone@users.noreply.github.com> Co-authored-by: giulio-leone <6887247+giulio-leone@users.noreply.github.com> Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>