Thanks for the post.
Google Gemini is now available in the coding assistant. https://developer.apple.com/documentation/xcode-release-notes/xcode-27-release-notes
Check this documentation how to set it up https://developer.apple.com/documentation/xcode/setting-up-coding-intelligence
The most common reason for a silent timeout, especially on a corporate network, is a firewall dropping the connection to Google's API endpoints. Make sure your network is not blocking access to generativelanguage.googleapis.com.
Xcode often logs detailed network and extension errors to the system log even when the UI just spins. Open the Console app on your Mac. Trigger the "New Conversation" in Xcode again. Look for logs mentioning network timeouts, SSL errors, or any errors.
Albert WWDR