Manual billing sync request — 429 "prepayment credits are depleted" despite linked, funded Direct billing account

Gemini API
1

Requesting a manual billing sync for my Gemini API project.

Every generateContent call returns HTTP 429 RESOURCE_EXHAUSTED with “Your prepayment credits are depleted,” even though my billing account is a Direct paid account, active, and linked to the project.

  • Project ID: clara-5009..
  • Project number: 7266471879..
  • Billing account ID: 01284D-8F1C3E-1950.. (Account type: Direct, project linked and confirmed in Account management)
  • Recently upgraded from free trial to paid; payment method on file.
  • API key: service-account-bound, prefix AQ. (not AIza)

What works: the key authenticates fine — models.list returns models.
What fails: only generateContent (tested gemini-2.5-flash), rejected before any usage registers (€0 spent shows in billing).

This matches other recent reports of the post-upgrade billing-sync issue. Please trigger a manual sync for this project. Thank you.