Why won’t it let customers view invoices

I'll make sure that your customers can view the invoices, rpropertyservi.

Most of the time, viewing issues are cause by the accumulated cache in the browser. To rule this out, you can let your customers open the invoice in a private or incognito window. This mode doesn’t store any cache, cookies, or site data. Here are the shortcut keys:
 

• Ctrl + Shift + N for Google Chrome
• Ctrl + Shift + P for Firefox & Microsoft Edge
• Command + Shift + N for Safari

If they're able to view the invoice with out any issues, they'll have to go back to their regular browser and then clear its cache to delete the stored temporary internet files. They may also use other supported browsers as an alternative.

In addition, you'll want to make sure that your customers are using the latest version of Adobe Reader/Acrobat. QuickBooks Online uses this application to control and manipulate the sales forms.

Lastly, I'm adding this article to learn how tp help manage the invoices that you send to your customers: Create invoices in QuickBooks Self-Employed.

Don't hesitate to visit us again here with any concerns or questions you may have. The Community always has your back.