As long as EPA can verify that both accounts are registered under the same company, EPA can transfer the properties (or account) on behalf of the former account owner. Send us a request including both Portfolio Manager usernames and which properties you want transferred.
To avoid similar complications and/or delays in the future, EPA strongly recommends creating a corporate account which "owns" all of your company's properties. An administrator can share/unshare properties with employees' individual accounts as necessary. When an employee leaves, this main corporate account can "unshare" with her/him. Also note - usernames cannot be changed, so select a username based on the organization, not on an individual's name.