Hi there!
Maybe this isn't the correct way of working with timecode, but i had an idea.
I usually have all audio related stuff in a Soundcraft mixer, which have multitrack recording. Sometimes I do ISO recordings and manually sync the multitrack audio (edited in a DAW) with the DaVinci project. I know devices like the Tentacle Sync can output a timecode signal in the form of audio to cameras that doesn't have a TC input, and then DaVinci can interpret that audio as TC.
If I could manage to connect the TC Out of the ATEM to an input of the mixer with an adapter (idea of this below), will that enable me to sync the audio recording to an ISO recording?

Thanks!