Users are not currently added in V2. If a user exists in Legacy, the first time they log into V2 the system will automatically create their V2 user account.
When a partner is migrating from the legacy app to v2-hybrid, the users will automatically populate in v2-hybrid. To clarify, there isn't any action required to send v1 users to v2-hybrid. Technically speaking, there is a cookie sent with the v1 user that v2 can use to pull the user over to v2-hybrid. In reality, while v2 is a hybrid platform, the user will live in v1 and simply be used by v2-hybrid.
To access users in v2-hybrid, navigate to the partner's v2-hybrid instance.
Click on Settings, then Org, then Users/span>/span>