Thank you for sharing the details, @VCSLLC. I can see that you've already performed the suggested steps provided by my colleague. Allow me to help you sort this out in no time.

Since you have encountered the same error while trying to deposit checks and have already attempted the troubleshooting steps, I suggest contacting our support team directly. They have the expertise and necessary tools to assist you further with the required steps to enable successful check deposits.

Here's how to reach them: 

1. Click the Help icon located at the top-right corner of your screen.
2. On the chat box, go to the Search tab.
3. Hit on the Contact Us below.
4. In the Select a Topic screen, click on Ask about something else.
5. Input a brief explanation of the issue and Hit Continue. 
6. Choose the chat or phone option. 

Please note that support is available for Plus, Essentials, and Simple Start subscribers from Monday to Friday, 6 AM to 6 PM Pacific Time, and Saturdays from 6 AM to 3 PM PT. For Advanced subscribers, support is available 24/7.

I've added this article to learn more about mobile check deposits for QuickBooks Checking and Money by QuickBooks: FAQ about mobile check deposits. 

I'm always here to help if you have further questions about depositing checks into your QBO mobile app. Feel free to get back to me anytime. Stay safe!