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Sounds about right. The mobile app does not do everything the browser version does
You'll want to reset your app data to restore to its default settings and be able to print the reconciliation report. Here's how:
However, if you're still unable to print the report, you can uninstall and reinstall the app to start fresh. Here's an article for your guide: QuickBooks App for Windows and Mac: General support.
I have included these Help articles about QuickBooks Online for your future reference.
If you need further assistance with QuickBooks, please get back to me. I'll be right here to help.