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Let's access your account via a private browser to check if it's a browser-related issue or not. Let me guide you how.
After that, go back to printing your reconciliation report again. If it's working, you can clear the cache of your regular browser. This process will clear up the stored data on your browser.
If you're still unable to print, please update your Adobe Reader/Acrobat. This steps fixes most printing problems in QuickBooks Online.
Otherwise, you can contact our Customer Care Support so we can investigate further. I'm attaching our page about resolving PDF printing issues for additional reference.
Stay in touch if you need help with anything else. I'd be glad to help. Thank you for posting and have a wonderful day.