I'm here to share some information so you'd be able to print your deposit slips, @bgoon.
When using printing deposit slips, you'd want to make sure you're using compatible device and meets the printing requirements. Let's try accessing your account your QuickBooks account on a regular browser. From here, you can try printing your deposit slips. Here's how:
Go to + New.
Select Bank Deposit.
Choose Setup and alignment to open the Print deposit slip setup page.
Pick View preview and print sample.
Place your printed sample deposit slip on top of a blank pre-printed form and hold both up to the light.
If the printed information lines up with the correct areas of the form, select Yes, I'm finished with setup in the Print window. If not, select No, continue with setup.
Just a heads-up, there are some features that your can do using a regular browser on a laptop or computer that are not available while using an iPad. You can open this article to see which model has which feature available: Compare mobile app features.
Lastly, you can check these articles that contains a complete guide on how to set up your system accurately so you can print deposit slips smoothly: