Mini5 lost twice

First, log in with your account and password on icloud.com. When prompted for a double verification code, click the "No Verification Code Received" button.

Then select "Send me a message" and you can log in normally through the SMS verification code.

After you lose it, you must log in to iCloud as soon as possible and turn on the "lost mode". If you add other trusted devices to your Mac or log in an AppleID, you can operate directly through these devices, otherwise you can only operate through the web version of iCloud.