Cannot upgrade from Tier 1 to Tier 2 — spent $484+ over 90 days, no Upgrade button visible

Hi, I’ve been using Gemini 2.5 Flash (image generation) since November 2025.

Project: Master AI (master-ai-482008) Total cost (90 days): ₫12.1M VND (~$484 USD) First payment: November 7, 2025 (90 days ago)

Both criteria are met (>$250 spend + >30 days), but I don’t see any Upgrade button on the API keys page (aistudio.google.com/app/apikey). My project still shows Tier 1.

Could someone please help check why the upgrade option isn’t appearing?

Thank you.