Hi, 远顺 陈
Welcome to the Microsoft Community.
Based on your description, my understanding is: you want to log in to TikTok, and you need to receive a verification code in your email to verify your identity. But you can't find the verification code in your email. Is that right?
Can you tell me some specific information, which will help me understand your problem:
1. What is the email account you use to receive the verification code?
2. Have you used this email account? How long have you not logged in to your account on account.microsoft.com?
3. Are you using Outlook Web App (OWA) or Outlook for Windows/Mac/iOS/Android?
Thank you for your understanding and cooperation.
Best regards
Mia.W - MSFT | Microsoft Community Support Specialist