Thank you for reaching out to the community!
I am sorry to hear that you are experiencing this with your invoices. I am confident that they will work; however, it does take some time to generate a report. Sometimes this process will take several minutes. Here is a full guide to assist you in exporting the invoices for your account. If you are still having trouble with this, our billing department will be happy to assist you in getting your invoices if you give them a quick call, you can find their contact information and hours here.
Please let us know if there is anything else we can do for you.