"The requested model is not supported." while using gemini3pro in Github Copilot

[fly-potato-100]

Question

I'm using GitHub Copilot Business with all models enabled by admin.

I've successfully configured the connection via opencode auth login and can use models like sonnet 4.5, gpt 5.2, and gemini 3 flash without issues.

However, when using gemini3pro, I get the following error:

The requested model is not supported.
Make sure the model is enabled in your copilot settings: https://github.com/settings/copilot/features

Is there something I'm missing or doing incorrectly?