How to sign in to Find My iPhone on iCloud.com
You can sign in to Find My iPhone on iCloud.com to locate a missing Apple device, even if you have lost your trusted device.
Sign in to Find My iPhone on iCloud.com
If you are asked to enter a code from a trusted device
If you go to icloud.com and sign in with your Apple ID and password, you may be asked to enter a code sent to a trusted device. To continue without entering a code, tap the Find iPhone button under “Or get quick access to”.
Note: You should set up multiple methods of verifying your identity in case one of your devices is lost or stolen. See the Apple Support article Two-factor authentication for Apple ID.