The main reason is that your Tik Tok and WeChat have not registered the same mobile phone number, so just change Tik Tok to the same number as WeChat. Just go through the settings, enter your account number and security, and change your mobile phone number. Let me show you:

Software version: 23.9.0. Mobile phone model: oppoReno7.

1. Open the Tik Tok app on your mobile phone, and click me in the lower right corner first.

2. Then click on the three bars in the upper right corner.

3. An interface will appear on the right, and then click the settings below.

4. Then click Account and Security above.

5. Then click on the phone binding.

6. Then click Replace.

7. Then enter the same mobile phone number as WeChat, and then click to get SMS verification code.

8. Finally, enter the verification code, and then click Finish to replace.

After the successful replacement, there will be no unauthorized access to WeChat. Go and try it ~