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This doesn't sound right. An "Online Invoice" should not require your customer to log into anything to view or pay the invoice (If you have enabled online payments).
I would recommend calling support so they can do what's called a "Glance" session and see exactly what's going on.
Good morning, @terriafnakasone,
@MarshallA is correct; it should just be opening to a page where the customer can pay directly. Has your customer tried opening the link through a different browser? Have you tried sending an invoice to yourself to see if you get the same result?
Let me know!