Do you (@WhiteNoise) have Sync working where your themes and plugins are syncing across devices?
Like the OP, I followed all of the instructions (to the best of my knowledge anyway) and none of my plugins or theme changes are synchronizing across my 3 devices (PC, iPhone & iPad).
I even tried turning those options off and back on again to no avail.
@Rai - I assume you haven’t found a solution yet?