Linking between User ID and all sorts of accounts
Linking between User ID and Facebook account / Google accounts / Apple ID (Sign in with Apple) needs to be set by User.
Please perform data linking on Home screen "Shortcut Menu" > "Other" > "Various Settings" > "Data Transfer" after login.
Account linking never expires.
*If you select "Data Transfer" on Home screen after installation, user Id will be created at the time.