Unable to link Steam account to other third-party accounts

[whiteboxdev]

I am trying to retrieve an auth session ticket with steamworks.user_get_auth_session_ticket(). This will allow me to link a player's Steam account to their PlayFab account to share friends lists, statistics, login services, etc.

The documentation for Steam's GetAuthSessionTicket() is here: https://partner.steamgames.com/doc/api/ISteamUser#GetAuthSessionTicket

This function should send a GetAuthSessionTicketResponse_t message to the steamworks listener, but no message is ever sent.