Fetion SMS failed to set the password, and received a prompt: "Your password is too simple". What happened?

Hello Fetion password requirements are: the password must be 6 to 16 characters composed of numbers, letters and symbols, and must contain both letters and numbers; Password cannot be Chinese or full-width characters. If you fail to set the password through SMS and receive a prompt similar to the above, it may be caused by the following reasons: the password length is less than 6 digits or greater than 16 digits, which will prompt that the password is too simple. Please use 6- 16 letters, numbers and symbols to set the password. The password cannot be Chinese or full-width characters. If the password you set contains Chinese or full-width characters, you will be prompted that the password cannot contain Chinese or full-width characters. Please use 6- 16 letters, numbers and symbols to set the password, which cannot be Chinese or full-width characters. If there are only numbers, letters or symbols in your password, hint: your password is too simple. Using letters, numbers or symbols alone as passwords poses security risks. Please use 6- 16 letters, numbers and symbols to set the password, which cannot be Chinese or full-width characters. If the setting is successful, you will receive the following message prompt (the sender number is 12520050): Welcome to use the Fetion service provided by China Mobile. Your password has been successfully modified. Please login to confirm that the new password is valid. If you need to continue to modify, please reply to the new password directly. Please contact 10086 for details.