Billing setup fails with OR_BACR2_44 after successful payment while upgrading Gemini API project to paid tier

Hello,

I am trying to upgrade my Gemini API project from Free Tier to Paid Tier in Google AI Studio, but billing setup fails with this error:

“Billing setup can’t be completed”
“This action couldn’t be completed. [OR_BACR2_44]”

What I already did:

  • Created a new Gemini API project
  • Created a new API key for that project
  • Added a payment method
  • Payment itself appears successful
  • Tried using the Set up billing flow in AI Studio
  • Billing still fails at the final step with OR_BACR2_44

Why this matters:
I am running a text-to-SQL evaluation workload using the Gemini API. My project is currently blocked by free-tier quota limits, so I need paid-tier billing to complete the evaluation.

Current API behavior:

  • Small smoke tests can work
  • Full evaluation runs fail with 429 RESOURCE_EXHAUSTED because the project is still on free-tier quota

Observed quota error from the API:

What I need help with:

  1. What does OR_BACR2_44 mean in this billing flow?
  2. Why can billing setup fail even after payment succeeds?
  3. Is this a Google Payments profile issue, a Cloud Billing issue, or an AI Studio project-linking issue?
  4. What exact steps should I take to successfully move this project to the paid tier?

Additional notes:

  • I already created a new project specifically to avoid the old free-tier quota issue
  • The API key works, but the project still behaves like free tier
  • I can provide screenshots if needed

Any guidance would help. Thank you.

Hello @Tanish_Kumar_Gup,

Please reach out directly to Google Cloud Billing Support here: Get Cloud Billing support  |  Cloud Customer Care  |  Google Cloud Documentation