It is because the account password is entered incorrectly, or the network is unstable and the mobile phone is damaged, which makes it impossible to log in. You can click on the epidemic prevention health code on the WeChat payment page for feedback. Taking WeChat as an example, the specific solution to the problem that the health code cannot be logged in is as follows: What if the health code cannot be logged in?
1. Open WeChat, switch to "Me" page and click "Pay".
2. Click "Epidemic Prevention Health Code" on the payment page.
3. Click on the three dot icons in the upper right corner.
4. Click on Feedback and "Function Error".
5. If you can't sign in by filling in the health code, click Submit.