This is the only authorized WeChat and Tik Tok to register the same mobile phone number. Just change your mobile phone number. It is also very likely that your operation method is wrong. The following is the correct operation method:

Operation demonstration version Tik Tok 23.9.0

1, first open Tik Tok, and then click I click on the three horizontal lines as shown in the figure below:

2, and then click Settings as shown in the figure below:

3. Then click Account and Security, as shown in the figure below:

4. Click the third-party account binding, as shown in the figure below:

5. Click on WeChat to authorize login, as shown below: