Thank you for taking the time to report this issue to the Community, although I apologize that you have not yet received a response.
If you are still needing assistance with connecting a Synchrony bank account in Quicken, please take a moment and review the information available here, and post back to let us know what version and release of Quicken you are using.
Synchrony Bank issues many credit cards that are specific to a retail establishment. Please also let us know which retail institution the account is for and if you are receiving any type of error message or code when attempting to add the account in Quicken and/or any troubleshooting steps you may have already tried.
The more information you can provide regarding this issue will help the Community to better understand and assist.