Stuck verifying old phone number during Apple Account 2FA setup on replacement iPad

The signed-in iPhone acts as the primary trusted device, allowing immediate trusted phone number updates in Settings > [Your Name] > Sign-In & Security without a 7-day wait; Apple Watch pairing status and Stage Manager state are irrelevant to the Secure Enclave authorization. Ensure the iPhone has >20% battery health to prevent unexpected shutdowns during the CloudKit key synchronization handshake. No CLI check exists for this specific auth token state, but log show --predicate 'subsystem == "com.apple.authd"' --last 5m confirms successful credential rotation.

Active liquid detection alerts on the iPhone’s connector will throttle the Secure Element communication required to sign the trusted number update request, potentially causing a silent failure in the Settings app. Thermal throttling from sustained Stage Manager workloads can similarly rate-limit the cloudd daemon propagating the change to Apple’s identity servers. Resolve hardware alerts and cool the device to ensure the cryptographic handshake completes before the session token expires.