feed2toot fails to register

When trying to use feed2toot one is requested to register it as a new app to the Mastodon/Pleroma Instance using register_feed2toot_app command.

This seems to suceed with registring the app:

May 30 07:49:11 gaos mix[27831]: #Ecto.Changeset< May 30 07:49:11 gaos mix[27831]: action: nil, May 30 07:49:11 gaos mix[27831]: changes: %{ May 30 07:49:11 gaos mix[27831]: client_id: "<gobble gobble>", May 30 07:49:11 gaos mix[27831]: client_name: "feed2toot", May 30 07:49:11 gaos mix[27831]: client_secret: "<gobble gobble>", May 30 07:49:11 gaos mix[27831]: redirect_uris: "urn:ietf:wg:oauth:2.0:oob", May 30 07:49:11 gaos mix[27831]: scopes: "read write follow" May 30 07:49:11 gaos mix[27831]: }, May 30 07:49:11 gaos mix[27831]: errors: [], May 30 07:49:11 gaos mix[27831]: data: #Pleroma.Web.OAuth.App<>, May 30 07:49:11 gaos mix[27831]: valid?: true May 30 07:49:11 gaos mix[27831]: > May 30 07:49:11 gaos mix[27831]: {:ok, May 30 07:49:11 gaos mix[27831]: %Pleroma.Web.OAuth.App{ May 30 07:49:11 gaos mix[27831]: __meta__: #Ecto.Schema.Metadata<:loaded, "apps">, May 30 07:49:11 gaos mix[27831]: client_id: "<gobble gobble>", May 30 07:49:11 gaos mix[27831]: client_name: "feed2toot", May 30 07:49:11 gaos mix[27831]: client_secret: "<gobble gobble>", May 30 07:49:11 gaos mix[27831]: id: 21, May 30 07:49:11 gaos mix[27831]: inserted_at: ~N[2018-05-30 07:49:11.335879], May 30 07:49:11 gaos mix[27831]: redirect_uris: "urn:ietf:wg:oauth:2.0:oob", May 30 07:49:11 gaos mix[27831]: scopes: "read write follow", May 30 07:49:11 gaos mix[27831]: updated_at: ~N[2018-05-30 07:49:11.335894], May 30 07:49:11 gaos mix[27831]: website: nil May 30 07:49:11 gaos mix[27831]: }}

But then fails when trying to login.