404 Not Found for gemini-2.5-pro on a specific paid project

Gemini API
1

Hi team,

I am encountering an HTTP 404 Not Found error when making requests to gemini-2.5-pro using an API key from a specific project with Pay-as-you-go enabled.

■ Endpoint:
POST https://generativelanguage.googleapis.com/v1beta/models/gemini-2.5-pro:generateContent

■ Error:
404 Not Found

■ Timestamp (JST):

  • 2026-07-28 14:40:49
  • 2026-07-28 14:41:02
  • 2026-07-28 14:41:50
  • 2026-07-28 14:44:22

■ Situation:

  • Using the exact same request body and code, it works as expected (200 OK) when tested with an API key from a different project.
  • However, with this specific project’s API key, it consistently returns a 404 error.

■ What we would like to check:
We would appreciate guidance or investigation on whether this is caused by:

  1. Project/Key configuration issues (e.g., Generative Language API not properly enabled, API restriction settings, or billing propagation delays).
  2. An internal project provisioning or synchronization issue for gemini-2.5-pro.

Note: The Project ID will be provided privately upon request from Google staff.

Could someone please help us check the status or logs? Thank you!