Thanks for reaching out to the Community, caitlin.
I'm here to ensure you can deposit your check using the mobile app.
In this case, you'll need to make sure you meet the criteria. All checks must be in your name, endorsed by you, and drawn on a bank account in the US or US territory. You can read through this article for more details: Learn about mobile check deposits.
If the issue persists even after verifying every info of the check. I suggest contacting our support team again. They have the necessary tools to check your account and ensure you deposit your checks.
Additionally, I'll be attaching these articles for future reference in recording mobile deposit mobile check deposits to deposit funds into QuickBooks Checking: