Workaround for Brave Browser's Sync Chain breaking after Migration Assistant (TL;DR in Description)
IMPORTANT: Read Carefully
You've gotta do these things in this order:
(and you must have your sync code ready)
1. Go to brave://settings
2. Reset the settings
3. Refresh and reset again (it'll ask 3 times)
4. Close
5. Repeat 1-3
6. Go to brave://sync-internals
7. Click "Stop Sync" and "Disable Sync" a few times each
8. Repeat 1-4 and 6-7
9. Go to brave://sync
10. Enter your sync code
11. COPY THE CODE
12. Refresh and paste the code again
13. DO NOT reset settings (instead click "Cancel" or "Ok")
14. Close and re-open the browser
15. Possibly repeat 12
Even with all that... some settings may not sync correctly - you may need to reinstall your theme, reset your search engine, and enter a password in again to give the password sync a jump start.
See also:
https://coolaj86.com/articles/workaro...