Thank you for visiting the QuickBooks Community. Our site can only assist with QuickBooks-specific issues. Since your concern is about integration with Royal Mail, there's a dedicated team that handles any issues regarding this. I'll ensure you'll be routed to the right support team to assist you further with this matter.
There are a variety of third-party applications that works with QuickBooks Self Employed (QBSE) to help you run your business. Then, the integration between QuickBooks and Royal Mail depends on how the 3rd party process the connection. That said, I suggest contacting the Royal Mail Support Team. They can pull up your account and provide you the detailed information about how their syncing process works. Also, investigate the cause of any issue you might encounter while using Royal Mail.
I'm also adding this article to view different information on how QuickBooks Self Employed tracks everything about your data to ensure that your account stays accurate: QuickBooks Self-Employed Overview.
Please don't hesitate to post your questions here that you might need help with managing your account. The Community Team is always available to assist you. Take care!
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