Hello there, @RGC20.

As of now, there's an investigation where some users are having difficulty to print checks in their QuickBooks Online (QBO). Rest assured, our engineering team is all hands to fix this as soon as possible.

For now, I recommend getting in touch with our support team. That way, you'll be added to the list of affected users and be notified via email of any updates.

To reach them, you can refer to the steps provided by colleague JonpriL above.

Also, I'm adding this article for reference in case you need to merge customers and vendors in your QBO: How to merge accounts, customers, and vendors.

We thank you for your patience while we're working to fix this. Should you have other concerns with your QBO account, don't hesitate to leave a comment below. We're always here to help.