In some cases, you may need to switch your profile to access the Invoices. Invoices and payment methods are associated with the personal profile. So, if you're signed in with a business profile, you'll be prompted to sign in using your personal profile. Similar to the prompt below:

https://helpx.adobe.com/enterprise/using/manage-invoices.html
Is this the issue you're facing? Or is it something else with the browser, PDF Viewer etc. If yes, can you let us know some details. Browser, default PDF Viewer, OS to help troubleshoot.