What it means
the address already belongs to an account or user.
How to handle it
Use another address or sign in to the account that already owns this address.
Wire contract
| Code | email_in_use |
|---|---|
| Class | conflict |
| HTTP status | 409 |
| Meta keys | None |
| Raised | Yes |
The response uses the standard {"error": {…}} envelope. Branch on error.code, not the human-readable message. Preserve request_id when reporting a failure.