The error category of QB error 5502 is that “Sync could not be completed”. Unfortunately, when your QuickBooks accounting software encounters error 5502 you will receive an error message – QuickBooks data has been uploaded, but failed to connect to the server.
How to Fix QuickBooks Error 5502
QuickBooks Error 5502 pops up due to the problem with Intuit online services or third-party developer application connections to QuickBooks. The data in your QuickBooks company file was uploaded successfully, but an error occurred while downloading the changes made by applications using Intuit online services or third-party developer application connections to QuickBooks. Also remember that if you don’t use any online application that modifies your data, you can ignore this error.
To troubleshoot you need to make sure that you are using the latest release of the Sync Manager.
The reason may be that the Intuit servers may be busy or unavailable at this time and the resolution process is to sync later.
If this solution does not resolve the issue or answer your question, you can read discussions and post messages and questions relating to your issue on the Intuit QuickBooks Support USA Community site introduced by Intuit or you can connect with the QuickBooks technical support for guidance and error fixation.