The Online Bill Pay feature is available in QuickBooks Online Essentials, Plus, and Advanced. Once you enable it, the widget can be found on your QuickBooks Online dashboard.
In the meantime, let's isolate this concern by performing the following browser troubleshooting steps. The stored data in your browser’s history can cause some odd errors and may affect QuickBooks’ performance.
Login to your QuickBooks Online account using an incognito or private browser.