Azure AD Collaboration - Invite any e-mail

Question

We have running an web app secured by Azure AD. There are a few forms the user is able to share with others. We are planning to use the azure ad guest invitation API for this. However i can not find a clear point in the documentation wheter any given e-mail address can be invited to the AD (so any user without being a user in any other tenant nor any microsoft account) or if the user always already needs to have an account?

Answer 1

Any email can be used if you are adding a Guest user (which is what the API does).

When the user is invited, a user entity (of userType Guest) is created

So they will get an account, it will be created in that tenant.