Hi there.

First off, did you happen to receive any email notifying you whether the check was rejected or returned? If you haven't checked yet, I'd recommend doing so for you to follow up with the check writer if the email says it has been returned.

If you haven't received any email, you'll want to check if your QuickBooks Checking or Money by QuickBooks account is active and in good standing. And make sure that checks are under your name, endorsed by you, and drawn on a bank account in the US or a US territory. 

Note that there are types of checks that aren't accepted. You may want to check out what are those in this link: Checks that aren't accepted.

Also, mobile deposit has limits. With this, I'd recommend signing in to your account on a mobile device. We'll display your limit when you begin the check capture process.

You can refer to this article that answers the frequently asked questions about mobile check deposit and its requirements: Find out more about mobile check deposit.

Additionally, I've included a helpful reference on what to do when you get a chargeback: Handle chargebacks and retrieval requests for QuickBooks Payments.

Fill me in if you have more queries about mobile deposits. I'd be glad to assist you further. Take care always and best regards.