I need a domain claim email sent (re-sent) to an Admin for their new Adobe Sign FedRamp account, who can I reach out to do this today?

A customer is migrating from Tailored to Adobe Sign FedRamp.  Their admin needs to claim the domain, but cannot find the email to do so and we need to get this moving as soon as possible.  How can we have that email re-sent to him today?  Thanks!