"invalid argument" error

Hello everyone!
I have been using google ai studio to develop my company website for over a year now. Since the recent changes in the bill payment (for both ai studio and gemini API), i am facing the invalid argument error. The changes as required by Google were accepted and pre-payments made on Thursday, 10th September 2026. However, I continue to face the issue.

To note:

  • the website do not use any AI

  • i created a new project and built a new app from scratch and its working as expected

    What I have attempted

  • moved linked billing account to pre-paid account as required

  • paid off any balance payment to other billing accounts

  • updated gemini API in the project to active billing account

  • downloaded the code in ZIP file and created a new project. It gives the same error

Can someone from the community help me please?

adarsh