Transfer license from agency to customer

Hello! An agency bought some licenses on behalf of the client to make a website. The problem is that now the client don’t have access to the developer’s help forum (and the agency has already finished its work with the client)

How can they transfer it to the owner of the website?

License FAQ | ThemeForest (1- 1. If you are a freelancer / agency using the item for a single end product for one client. The license would in effect be transferred to the client. )

Thanks!

The agency can transfer the license to use the item but support, downloads, and updates (this can be configured using WP-admin) will only ever be available to the purchasing account.