I’ve sign up and paid my subscription but it still won’t let me make an invoice

I'm here to help ensure you're able to create an invoice in QuickBooks Online, userj-chad-j.

There are times that your default browser is filled with data and temporary files from previously visited websites. With this said, I recommend using a private browser. Doing so helps isolate the issue. 

Once you've opened a private browser, then create a new invoice again.

If it works, to ensure this doesn't happen again, it's a good idea to clear the cache of the browser you're using or try other supported browsers. 

If not, you need  to check the access given to you by the Company or Master admin. You'll need to have permissions to access the areas of Customers & Sales to be able to create invoices.

You can let them review your access rights to the company file through this link: Get to know user types and permissions.

Please get back to me on how this goes by commenting below. I'll be around until you're able to create an invoice.