How to fix HTTP 500 Internal Server Error for a specific Google Workspace user in Antigravity?

One of your Google Workspace users can’t access Gemini features and hits an HTTP 500 Internal Server Error, while other users are fine. The error started after an account change (most often a primary email/username update). This points to a stuck identity/entitlement mapping between Workspace and Google’s internal “Antigravity” service that backs Gemini for Workspace. The fix is to re-sync the user’s identity and entitlements by reverting the email change (or reapplying it correctly), resetting sessions/tokens, and re-provisioning the Gemini license.

How to fix HTTP 500 Internal Server Error for a specific Google Workspace user in Antigravity?

Affected users report a persistent “HTTP 500 Internal Server Error” whenever they try to open Gemini experiences (e.g., gemini.google.com, Gemini side panel in Gmail/Docs, or Chat integrations). The issue targets a single Workspace identity and often appears right after the user’s primary email address was changed. Other accounts in the same domain continue to work.

In Google’s internal escalation notes shared with customers, the “Antigravity” API (the link between Workspace identity and Gemini) is failing for that user. Admins also noted that unassigning/reassigning the Gemini license alone doesn’t always clear it unless identity state is refreshed.

If you’re comparing similar outages in consumer AI apps, you may find patterns like session or entitlement corruption. For a quick primer on handling 500s in AI apps, see this short internal server error guide.

Solution Overview

How to fix HTTP 500 Internal Server Error for a specific Google Workspace user in Antigravity?

Step-by-Step Solution

1. Confirm scope and collect facts

• Verify only one user is affected and others can access Gemini normally.
• Ask the user if their primary email/username was changed recently.
• Test from a clean browser profile or Incognito to rule out local cache.

2. If the user’s primary email was changed, re-sync identity

• Best practice sequence (Admin console):
• Admin console: Directory > Users > open the affected user.
• Temporarily change Primary email back to the previous address, save, and wait 5–15 minutes for propagation. Reference: Change a user’s email address.
• Then change the Primary email again to the intended new address and wait another 5–15 minutes.
• Keep the prior address as an alias only after the final switch (don’t keep both as primary across accounts).
• API option (Directory API) if you manage changes via automation:
• Make sure you have domain-wide delegation and an OAuth 2.0 access token with Admin SDK Directory scopes.
• Replace placeholders before running.

# Prerequisite: Set ACCESS_TOKEN with a valid Admin SDK Directory API token
# Revert to the old primary email
curl -s -X PATCH \
 -H "Authorization: Bearer $ACCESS_TOKEN" \
 -H "Content-Type: application/json" \
 https://admin.googleapis.com/admin/directory/v1/users/USERKEY \
 -d '{
 "primaryEmail": "old.primary@your-domain.com"
 }'

# After propagation, set the intended new primary email
curl -s -X PATCH \
 -H "Authorization: Bearer $ACCESS_TOKEN" \
 -H "Content-Type: application/json" \
 https://admin.googleapis.com/admin/directory/v1/users/USERKEY \
 -d '{
 "primaryEmail": "new.primary@your-domain.com"
 }'

3. Force reset sessions and tokens for the affected user

• Admin console (quickest):
• Directory > Users > the user > Security.
• Click Reset sign-in cookies (forces new sessions across devices). Reference: Reset a user’s sign-in cookies.
• Optionally revoke third‑party app tokens.
• API option:
• Sign the user out from all web and device sessions:
• Docs: Directory API users.signOut

curl -s -X POST \
 -H "Authorization: Bearer $ACCESS_TOKEN" \
 https://admin.googleapis.com/admin/directory/v1/users/USERKEY/signOut

• Revoke third‑party OAuth tokens (list then delete):
• Docs: Directory API tokens

# List existing tokens for the user
curl -s -H "Authorization: Bearer $ACCESS_TOKEN" \
 "https://admin.googleapis.com/admin/directory/v1/users/USERKEY/tokens"

# Revoke a specific token (replace APPLICATION_ID from the list response)
curl -s -X DELETE \
 -H "Authorization: Bearer $ACCESS_TOKEN" \
 "https://admin.googleapis.com/admin/directory/v1/users/USERKEY/tokens/APPLICATION_ID"

• Have the user:
• Sign out of all Google sessions.
• Clear site data for google.com and gemini.google.com, or use a fresh profile. Reference: Clear cache & cookies.

4. Re-provision the Gemini license and access

• Admin console:
• Billing > Subscriptions > confirm your Gemini for Google Workspace subscription is active.
• Directory > Users > open the user > Licenses.
• Remove the Gemini license, wait ~2–5 minutes, then assign it again. Reference: Assign, remove, or change licenses.
• Admin console: Apps > Additional Google services > ensure Gemini is ON for the user’s OU. Reference: Get Gemini for Google Workspace.
• Have the user sign back in and test:
• gemini.google.com
• The Gemini side panel in Gmail/Docs
• Google Chat (Gemini app if enabled)

5. Validate and document

• If the 500 error is gone, document the email-change timeline and the exact steps that fixed it (helps if this reoccurs).

Alternative Fixes & Workarounds

• Create a fresh user and transfer data:
• If production is blocked and the error persists, create a new user with the desired primary email, assign the Gemini license, and use Admin tools to transfer Drive and other assets.
• Roll back to the old primary email permanently:
• If the new address is optional, keeping the old address as primary (and the new as an alias) avoids re-triggering the issue.
• Open an enterprise support escalation referencing “HTTP 500 for single user after primary email change—identity mapping issue in Antigravity”:
• Include timestamps, affected user, previous vs new primary email, and steps tried above.
• Temporary migration:
• If your team must keep working with an AI assistant during the fix window, you can temporarily switch providers. If you ever face errors elsewhere, here’s a compact reference on resolving outages: common Claude AI error patterns and quick fixes.

Troubleshooting Tips

• Check service health: Google Workspace Status Dashboard.
• Confirm eligibility and policy switches:
• Gemini is turned ON for the user’s OU.
• No App access control or context-aware access policy is blocking Gemini. See Control which third-party and internal apps access Google Workspace data.
• Region and age restrictions:
• Verify the user meets Gemini availability requirements in your region and organization policy.
• Browser isolation:
• Test in a different browser or a clean profile to rule out stale cookies.
• Related reading on handling 500s in AI tools:
• Read More: Fixing Internal Server Error in Janitor AI

Best Practices

• Before changing a primary email:
• Unassign the Gemini license for that user.
• Change the primary email and wait 10–15 minutes.
• Reset sign-in cookies, then reassign the Gemini license.
• Minimize frequent primary email changes for licensed AI users.
• Use change windows and communicate timing to the user to avoid mid-session conflicts.
• Keep the previous address as an alias after the final change (not as a separate user).
• Track a runbook that includes identity re-sync, session resets, and license reprovisioning.

Final Thought

The 500 error in this case isn’t about the user’s browser—it’s an identity and entitlement mismatch after an email change. By re-syncing the primary email, resetting sessions/tokens, and re-provisioning the Gemini license, you refresh the “Antigravity” link for that user and restore access quickly. If you see similar 500s in consumer AI apps, this quick troubleshooting guide to internal server errors can help you spot patterns fast.