I believe the patching itself should have worked. The patcher did not throw errors, and other patches confirmed to work (e.g show all games). That was on MacOS btw. 
This is the fork I used:
https://github.com/ragnarokxg/kobopa...leases/tag/V87
I realize the result in this case was just that the entries Dropbox and Gdrive did not show up. I also tried the nickelmenu way, and that threw the unauthorized error I was talking about above. Even kobocloud is not working on this FW.