Have a look at the Resolve manual on AAF workflow for import and export steps, it is really useful.
Are you getting a conformed timeline with all media offline?
I had an issue with REDcine 17 exporting ProRes Quicktimes with camera timecode breaking 1/3 of the through the file. This meant the Resolve conform was impossible with the AAF or XML. The timeline would be built, but all media was offline. I had to re-export my offline (used master timeline in Resolve this time) reconnect media in NLE and re-export AAF or XML.
I was using EPIC 5K footage at 25 frames. REDcine 17.3 looks to have fixed the issue.