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A "Resend email" allows you to resend the email to the user if you prefer not to confirm them.
If the user’s account is not confirmed within 7 days, the system will automatically delete the account.
Organizations that have email-based self-registration enabled and also create users via other mechanisms such as HRIS or Active Directory integration may find themselves in a position where a user is asked to confirm their account but can’t. This is generally because the user created an account by self-registering in the system, and the HRIS / Active Directory system later changed the same user’s authentication method from “Email-based self registration” to another method, such as LDAPS, SAML or OAUTH. If a user is asked to confirm their account, simply switch their authentication back to “Email-based self-registration”, confirm the account using the procedure above, and then switch it back to LDAPS, SAML or OAUTH. The procedure to switch a user’s authentication method is described here: Changing a User's Authentication Method