OAuth verification stuck on "Homepage requirements" - Firebase web.app domain not recognized

I’m trying to complete OAuth app verification for my project, but the Verification Center shows:

  • Branding status: Verified :white_check_mark:

  • Data access status: Under review, but blocked by “Homepage requirements” :cross_mark:

The error says: “Your app has not met homepage requirements. Homepage website is not registered.”

My setup:

  • GCP Project: (PII Removed by Staff)

  • Homepage URL: https://ruribitaki2.web.app (Firebase Hosting)

  • Privacy Policy: https://ruribitaki2.web.app/privacy

  • Terms of Service: https://ruribitaki2.web.app/terms

  • Authorized domains: ruribitaki2.web.app, ruribitaki2.firebaseapp.com

  • Domain ownership verified in Google Search Console under the same account as GCP project owner

  • Scopes: analytics.readonly, analytics.manage.users.readonly, webmasters.readonly

What I’ve tried:

  • Verified domain ownership in Search Console (confirmed as owner)

  • Confirmed the same Google account owns both the GCP project and Search Console property

  • All OAuth consent screen fields are correctly configured

My question:
Is the web.app domain considered a “third-party platform where subdomain ownership cannot be verified”? Do I need to set up a custom domain on Firebase Hosting to pass the homepage requirement?

I cannot resubmit verification or contact the Trust & Safety team directly. No email has been received from them.

Any guidance would be appreciated.