There’s only one you can do to fix it and get your app transactions matched, llcamanie.
I recognize how important it is to categorize transactions to ensure smooth reconciliation. Since QuickBooks Online solely relies on the information shared by your application, it's best to contact your app provider for assistance. They can help review the mapping and all the setup to ensure you can match your transactions appropriately in the program without any errors.
Once resolved, you can immediately add or match your transactions. I've also included a detailed resource to guarantee records are accurate and balanced: A complete reconciliation guide.
Please don't hesitate to let me know if you have any other questions or concerns about managing your company events. I'm always around to lend a hand, llcamanie.