Good day @fa3,
I'm here to help share information about how you can print your reports successfully.
To start, let's try to update or repair your PDF tool reader. This can be one of the reasons why you cannot print your reports.
With this, here's an article you can read you can read for the detailed steps in updating or repairing your PDF tool reader depending on your operating system (Windows or Mac): How to Update, Repair, or Re-install Adobe Reader/Acrobat?
Secondly, let's log in your QuickBooks Online (QBO) account to a new private or incognito window to check if it's not your browser causing the issue.
If you can successfully print your reports, you can clear your browser's cache to optimize it and to maximize your QBO experience. Or switch to a different web browser application.
However, if you still can't print your reports, I suggest contacting our Customer Care Team. They can help you investigate this further and help you print your reports.
Let me know if you have any other questions. I'll be always around here in the Community to help you.