Error #3501 (SUBSCRIPTION_REQUIRED) on Personal Account - Persistent across multiple accounts and networks

Google Antigravity
1

Hello,

I am consistently encountering Error #3501 (HTTP 403 Forbidden) when trying to send prompts in Antigravity. It appears my requests are incorrectly hitting the enterprise endpoint (cloudaicompanion.googleapis.com) instead of the personal entitlement flow.

Troubleshooting steps I have already attempted:

  • Completely reinstalled Antigravity and cleared local config/cache files (~/.antigravity, AppData).
  • Revoked and re-granted OAuth permissions under Google Account > Security > Third-party apps.
  • Tested across multiple networks (home Wi-Fi, mobile hotspot, and VPN nodes).

None of these resolved the issue, suggesting a backend IAM routing flag on Google’s side.

Debug details:

  • Error Code: 403 (PERMISSION_DENIED)
  • Reason: SUBSCRIPTION_REQUIRED / Error Number 1001
  • Trajectory ID: ea161ad8-62dc-478c-8a6b-d6dfa6c0a4..
  • TraceID: 0x60c5f8e3a66dbe..
  • Timestamp: Wed, 19 Aug 2026 12:22:07 GMT

Could a team member please look into this or clear the routing flag for this trajectory?

Thank you!

2

Hello,

I am experiencing the exact same issue with my personal account. The CLI is incorrectly hitting the enterprise endpoint and blocking me with Error #3501.

Here are my debug details:

  • Affected Account: ebra****************@gmail.com
  • Error Code: 403 (PERMISSION_DENIED)
  • Reason: SUBSCRIPTION_REQUIRED / Error Number 1001
  • Trajectory ID: c3e91743-bbe9-4806-ba54-9***********
  • TraceID: 0x8caea1829*********

Could a team member please look into this and clear the routing flag for my account?

Thank you!