Perhaps it's a dead end, but I don't understand the reference to iTunes in this Console entry:

Mar 9 18:53:26 Richards-MacBook-Pro com.apple.xpc.launchd[1] (com.apple.xpc.launchd.domain.pid.Photos.7521): Path not allowed in target domain: type = pid, path = /Library/Frameworks/iTunesLibrary.framework/Versions/A/XPCServices/com.apple.iTunesLibraryService.xpc error = 147: The specified service did not ship in the requestor's bundle, origin = /Applications/Photos.app (Emphasis added)

As I previously requested, please link us to the instructions you followed.

The new Great Equalizer is the SEND button.

In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire