Invoice errors in QuickBooks Online usually boil down to a couple of quick fixes, such as a missing tax code or incomplete customer details. To help us narrow this down, could you share exactly what happens when you try to create the invoice, and let us know if you are seeing a specific error message?
Go to the Gear or Settings ⚙ icon and select Subscriptions and billing.
Make sure the status is Subscribed and the next billing date shows a future date.
If your subscription status looks good, you can try logging into your account via another browser, like Google Chrome or Microsoft Edge, to create the invoice.
Let me know if you need anything else. We're always here to help.
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