Once you succeed in MWS authorization, tool4seller will fetch up the last 30days data of your seller account for comprehensive analytics. This will usually take 4-6 hours to complete the process. Then re-login to tool4seller and start to check analytics reports.
There are also two reasons to explain why you can not see any data after connecting your Amazon seller account to tool4seller successfully for a long time.
(1) One is that if your seller account has extensive data, it will reach the peak of the API transmission speed which takes up more than 6 hours.
(2) The other is if you connect multiple Amazon seller accounts to tool4seller, it will also slow the data sync speed.
Please contact our online customer service if the data fails to display.