If you’re using the same browser to log into all of the stores you are trying to sync, sometimes a session conflict occurs. To avoid this, we ask you to copy the source store’s unique key somewhere and log out completely from this store. Open your destination store, open Syncio and copy the source store’s unique key into ‘Source Stores’ -> ‘Connect to a source store using a Unique Key’ text field.
If you are still having issues with syncing your stores, please email us at firstname.lastname@example.org
or send us a Facebook message!