So you are getting the QuickBooks error code 324. Don’t worry, you are facing the most common QuickBooks error that can be solved easily. There is some specific reason behind the issues and you should be aware of the reasons. The corrupted downloads and or unfinished installation, corrupted windows registry, virus or malware attack, etc. could be the main cause for this error. Now follow the two-step method to get fixed:
Solution 1. You need to reconnect your account and manually update it
Solution 2. You can try to add a new account in QuickBooks
When you do so you can solve your issue.

visit: https://qbpremiersupport.com/quickbooks-error-324/