Quick update: I have been able to resolve the issue by going into the Deco app and manually adding the old S4 devices to the new S7 network. All items now fully functional.

I had a Deco S4 network that I was looking to add some Deco S7 devices onto as part of an upgrade. I used the Deco app to try and replace the main device and it gave me an error at the end of the...