Error code 403 when logging in to a Google account to unlock my Xperia

IMPORTANT: This article applies only to specific products and/or operating systems. Check Applicable Products and Categories for details.

You may be facing a device lock issue due to Protection by my Xperia; try the following steps to unlock the device.

1. Check the protection status of my Xperia on the screen when you start the device.
   
   Note: If the device is locked without the screen of my Xperia, please try the following FAQ: I can’t unlock my screen (Android version 5.0 or higher).
2. Tap the Authenticate button and make a note of both Verification URL and User Code.
   
   Note: Verification URL example: https://www.google.com/device
3. Use another device (such as a PC) to access the Verification URL and enter your User Code. Then tap the Next button.
4. Once logged in to my Xperia, please enter your registered email address for the Google™ account authentication. Then tap the Next button.
5. Please enter the passwords for your Google account. Then tap the Next button.
6. If your Google account is successfully authenticated, you will see The device has been connected.
7. Please back to your device in the state of Step-2, tap Submit, confirm if the device is unlocked, and then tap the ACTIVATE button.