You don’t AMA link MXF/DNxHD files from Resolve. Those are native Avid OPAton files. The MXF AMA plug-in is for OPAtom 1A files like those created by CanonC300, etc.
In Resolve:
1. Make sure there is REEL info in the mediapool for each clip. This is done via settings and “assit conform” If nothing else, use “filename.
2. Create timeline, correct if you want, then export our as MXF/DNxHD (codec rate or your choice)
3. Put these files into a numbered folder inside the Avid MediaFiles/MXF folder.
4. Launch Media Composer. It will index the mediafile folders and create the msm files as part of the process if none was there, or update an existing one.
5. In a bin, import the msm file and it will create the master clips.
Michael