Hi there, @gatman-sp-gmail-.
Thanks for posting your concern in the Community today. You can let your customers view the invoice using a private browser or an incognito browser.
This way we can isolate the prompt for a possible browser-related. Here are the shortcut keys you can use:
- Google Chrome, press CTRL + Shift + N
- Mozilla Firefox: press CTRL + Shift + P
- Safari: press Command + Shift + N
If they can view their invoice successfully, you'd want to let them clear the cache of their regular web browser. Otherwise, let them use other supported browsers.
For future reference, check out this article to view different details on how QBSE tracks everything about your transactions so your account stays accurate: QuickBooks Self-Employed Overview.
Let me know if you have other questions or concerns about invoices. The Community is here to lend a hand.