Asking for OpenAI API Key when trying to use chat

**Describe the bug**
When I open chat and try to use it, it keeps asking for Open API key:

**Versions**
- Copilot for Xcode: 0.35.2
- Xcode: 16.2
- macOS: 15.2

1. Open Xcode with Copilot running
2. Open the chat and send any message, such as "explain the selected code"

**Screenshots**

**Additional context**
Code completions are working fine when coding in the editor.