I cannot create an invoice

Welcome to the Communit, jeff.
 

I want to ensure you can create an invoice in QuickBooks Online (QBO)..

There are times when the browser you're using has data issues, thus causing QuickBooks to act weirdly. To verify, let's log in to your QuickBooks Online (QBO) account using a private browser. To do so, press this shortcut key on your keyboard:

• Google Chrome: Ctrl + Shift + N
• Mozilla Firefox: Ctrl + Shift + P
• Safari: Command + Option + P

If this doesn't work, you need to clear the browser's cache so the system can start fresh. If you get the same result while using a private browser, I suggest switching to a different supported browser.

Furthermore, I also suggest checking on the user roles if the company admin allowed you to create an invoice in QBO. 

Moreover, I'm adding this helpful article as your reference in customizing your sales forms in QBO: Customize invoices, estimates, and sales receipts in QuickBooks Online.

Come back to this post if you have other concerns about creating invoice in QuickBooks Online. I'll be here to lend a hand. Have a good one!