I do hate how it doesn't tell me which record (or even record type) is read-only that is preventing the merge, but whatever. I used XRM Toolbox's Related Records Analyzer and there are a lot of related records on the "secondary" one I'm trying to merge from. Some inactive, some complete, etc. However, what I found was:
- I am able to merge them as a System Admin
- After troubleshooting for hours, I set up a security role with EVERY SINGLE PERMISSION turned on (full green for those that allow it). I did this in classic obviously because it lets you turn them on in bulk there, unlike the "new" look. I assigned that role to the user and they STILL got the message above and would not let them merge together.

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