Why does China Construction Bank need an authorization code every time it logs into Android mobile banking?

There are many ways to log in to Android mobile banking of China Construction Bank, such as account password login, fingerprint login and authorization code login. If you don't need an authorization code to log in, you can turn on the login switch in other ways after successfully logging in to the app (as shown below).

If you can't get the authorization code when logging in to the mobile banking for the first time, you can enter the mobile phone number of the mobile banking, then choose No when selecting "Is this a local phone number", and then send a short message "88#88" to 95533 with the mobile phone number of the mobile banking to get the authorization code. Please don't include other Chinese information and text descriptions in the short message. ?

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How to log in to the mobile banking client with iPhone and get the authorization code;

When using the iPhone mobile banking client to log in to mobile banking, click the "Get Authorization Code" button on the login page and send a short message "88#88" to 95533 to apply for an authorization code.

Tips: In order to view the authorization code conveniently, please turn on the SMS preview function of iPhone. ?

What if China Construction Bank-Mobile Banking can't get the authorization code?

China Construction Bank-How to get the authorization code when logging in to the mobile banking client with iPhone?