Solution:
Method 1: We found that the networks in some areas of Quanzhou and Shanghai are blocked by operators. Friends in these two places can use accelerators and try connecting to networks in other areas, which can effectively relieve network restrictions.
Method 2: Enter through the Forgot Password button, then follow the steps step by step, change it and then enter again. You can skip the login interface directly, but there are a few steps. You don’t need to change the password. It’s no problem to set it to the original one.
Method three: Change the browser. According to current tests, Quark browser and Chrome browser can be accessed. You can give it a try.
Method 4: Associate your Nintendo account with your Apple ID. When logging in, select [Log in with Apple] below and you may be able to log in successfully.