MFA page is updated

We have reviewed the MFA operation process and reorganized the website for better clarity. For details on the changes and how to use the page, please see the main content below.

The main changes are as follows:

• Revision of MFA enrollment requirements
  (Previously: two devices were required → Now: a minimum of one device is sufficient)
  In addition, the activation process has been discontinued due to automation
  *No impact on existing users

• Reorganized the structure of the MFA setup instructions

• Improved wording in several sections for better clarity