Most common display issues might be caused by too many cache files in the browser. This is the possible reason your customers are unable to see your invoice sent.
To help fix this, I recommend accessing your QBO account via a private browser. You can also have your customers access the View invoice link through a private browser. It's a great way in isolating the issue since it doesn’t store data in the cache. Here are the following keyboard shortcuts:
Google Chrome: CTRL + Shift + N
Safari: Command + Shift + N
Mozilla Firefox: CTRL + Shift + P
From there, you can create a test invoice and resend it. If it works, you can go to your regular browser and clear its cache. This deletes the stored cache files and gets a clean slate in the browser. If not, you can use other supported browsers.
Stay in touch if you have other questions or concerns about invoices. The Community is here to lend a hand. Thanks for joining and I wish you have a lovely day ahead.
Your telling me over 100 customers have the same issue of clearing cache. QuickBooks has made a change without informing the customer. QuickBooks has changed the verbiage and the way the invoice is viewed. You cannot view the invoice unless you click on "Pay Invoice". Most people want to review an invoice or it needs to be sent for approval before PAYing. It only makes sense to see/view the invoice before making payment.
Let me make it up to you by making sure your customers can view their invoices before paying them. First, I'd agree that having other options to see the invoices will ensure your customers can review them.
I've got steps you can consider performing. You can send the invoice as a PDF attachment instead. This way, your customers can see them before making their payments.
Let's perform a few tweaks on the Account and Settings page to achieve this. Here's how:
Click the Gear icon, and then choose Account and Settings.
Select the Sales tab, and then navigate through the Online delivery section.
Make sure to check the PDF Attached box, and then choose Online invoice from the drop-down.