Step-by-step remote session setup?

[howie b]

We are recording audiobooks remotely -- single mono track, narrator in studio booth, director/engineer offsite, recording and doing post in Pro Tools. Our problem is this: we are able to receive and send live audio (for talkback) but can't figure a way to send playback from the engineer to the narrator. We've been using the Source Connect plugin and Source Connect Nexus, and have tried about every signal path we can think of. Youtube videos have been a big help, but don't solve the playback issue. Can anybody point us to a checklist or step by step instructions that will solve the playback problem? Thanks, and stay safe!