Let's do some troubleshooting to isolate the issue and to see if it's browser-related.
The best way to handle this type of behavior is to clear the cache and cookies of the browser you're using for QuickBooks Online. These files can become outdated, causing issues like blank pages being printed when you try to print a report. Here's a link to help you with the process: Clear Web Browser History.
Let me know how this goes for you! I'll be on standby waiting for your response. Talk to you soon.
Print Report in QBO gives me a blank page. What is wrong?
Sorry but that didn't work but it made me realize I was using the QBOA App. When I logged in using the website I didn't have that problem. Still need to know why the App doesn't work. Thank you for your help.