I'm here to help ensure this issue gets resolved, jaliah1112.
To start, could you please let us know the specific error you encountered when trying to deposit your check?
A cache-related problem is likely causing the situation. If this is the case, let's perform some troubleshooting steps. We can use a private or incognito window to rule this out in your browser.
Here are the shortcut keys:
For Mozilla Firefox browser: Ctrl + Shift + P
For Google Chrome browser: Ctrl + Shift + N
For Safari browser: Command + Shift + N
Next, log in to your QuickBooks Online (QBO) account and deposit your check again. If it works, clear your browser's cache. This removes the webpage data that's causing the issue. If a private browser doesn't work, use other installed supported browsers as an alternative.