accordingly, we consulted the customer service of China Teachers' Qualification Network, and we can try to use Google Browser for the problem that the QR code cannot be found. Regarding the unsuccessful uploading of online signature, after the first unsuccessful uploading of signature,

don't re-sign. You can log in to the website every half a day and try another mobile phone.

If all the above are unsuccessful, you need to send an email to China Teacher Qualification Network, and the email address is below its home page in official website. Explain the problem in the email, and attach your account password and a photo of your ID card (to prove that you are yourself). China Teacher Qualification Network will test the questions after receiving the email, and then give you feedback. The final signature is still to be done by yourself.