I understand the challenges when you're unable to seamlessly sync customer data from Shopify to QuickBooks, Tiara. I appreciate you for taking the time to tell us about your concern. I'll make sure you'll be guided to the right support available.
Please know that QuickBooks only rely on the transactions posted from your integrated third-party app. Thus, you can check the App settings to see if it's set up correctly.
Otherwise, you can contact their Customer Support Team for assistance with the integration process. You can find their contact details on their website or in their support section.
Feel free to also browse this link for more insights on how the integration works and the answers to the most frequently asked questions about it: QuickBooks & Shopify Better together.
Keep your posts coming if you have other questions or concerns with Shopify transactions. I'll be here to help. Take care and stay safe.
