731f2a6c29
Since around mid-2026 Apple's idmsa endpoints `POST
/verify/trusteddevice/securitycode` and `POST /verify/phone/securitycode`
return HTTP 409 (instead of 2xx) even when the submitted code is accepted:
the response body carries `"securityCode": {..., "valid": true}` and the
response headers include a fresh X-Apple-Session-Token, scnt and
X-Apple-Auth-Attributes, which are only issued on successful validation.
rclone treated any 409 as failure and aborted before TrustSession, so
configuring an iclouddrive remote always failed after the 2FA step with:
validate2FACode failed: HTTP error 409 (409 ) returned body:
"{... \"securityCode\": {\"code\": \"...\", \"valid\": true} ...}"
Treat a 409 response that carries X-Apple-Session-Token as success: absorb
the session headers and continue to TrustSession. Applies to both the
trusted-device and SMS validation paths.
Fixes #9488
Closes #9534
Co-authored-by: Claude Opus 5 <noreply@anthropic.com>