FTC service is enabled on FGT VDOMs by default. So an FGT VDOM with a valid FTC license automatically becomes an auth client of FTC the moment it is created.

FTC supports up to four MFA methods, namely FTM, FTK, SMS, and email. The MFA method is set on a per-realm basis. The default method is FTM, but the admin user can change it to another method if needed. Sub-admins can then further change the MFA methods for end-users in their assigned realms to something other than the default (i.e., FTM). The Users page shows the MFA methods used by individual end-users.