Virtual cabinet have a very useful guide for clients using the portal with videos and step by step guides: https://www.virtualcabinet.com/how-to-guides/client-portal-full-recipient-guide

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Here is a link to portal login page: https://www.virtualcabinetportal.com/MyPortal/Login

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Another important point to add is to ensure that the email address that the client is using is the same one they have used previously to login into the portal.