We're aware that some QuickBooks Online (QBO) users are currently experiencing errors when sending invoices. Our engineers are working to fix it as soon as possible.
In the meantime, I suggest downloading the PDF file and sending them out manually via your email provider. This way, you'll be able to send invoices real-time. Here's how:
Select Print or Preview and then hit Print Preview.
Click the Download icon.
Once done, login to your email account and attach the file to send an invoice.
We'll share updates as soon as we learn more. You may also check for updates on your end from time to time through this link: https://status.quickbooks.intuit.com/.
Thank you for your understanding while we're working on a fix.
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