I too also tried Brave Sync thinking it would also migrate rewards from primary desktop browser but it does not.
Instead, I used the rewards settings screen and snagged the backup snippet and restored it on the other PC in my living room.
It doesn’t look like any of the settings were migrated, so basically, the Brave Sync is not as powerful as I hopped and will not be using it in the future. I hope it get’s another update that’ll properly sync everything.
I was under the impression this is what brave sync was actually for, but it’s not… for now??