I appreciate you sharing your concern about sending invoices in QuickBooks Online (QBO). Let's perform some troubleshooting steps to resolve this.
One of the recommended solutions to fix the error is to check your company and customer-facing email address fields. Please make sure they are complete, have the correct format, and don't have prefixes. If you haven't performed this yet, follow the steps below:
If you use location tracking, we can check the email address format of the location you used on the sales form. Here's how:
If the same thing happens, open your QuickBooks Online (QBO) account using a private or incognito window to check if this is a cache-related issue. You can use the following keyboard shortcuts:
Once signed in, send your invoices again. If it works without issues, go back to your regular browser and clear the cache. Restart your browser right after. If the issue remains, log in to your account using other supported browsers like Firefox, Google Chrome, Safari, and Microsoft Edge.
Additionally, you can refer to this article in processing invoice payments: Record invoice payments in QuickBooks Online.
If you have any other follow-up questions about sending invoices in QuickBooks, let me know by commenting below. I'm here to provide help.
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