Hi there, @ExtraMeasureLLC.
I'd appreciate you for providing a complete detail and a screenshot about your concern. Allow me to give some information on how viewing 1099 works.
Is your client's old account QuickBooks Self-Employed or QuickBooks Online? One possible reason why you're client didn't saw his information is because he created a new QuickBooks Self-Employed account instead of accessing his existing account.
If your client's existing account is QuickBooks Self-Employed, you can let him try to access his account using his full email address as the username. You can access QuickBooks Self-Employed via https://selfemployed.intuit.com/login.
While you can sign in to QuickBooks Online via https://c70.qbo.intuit.com/c70/v1810.568/0/login?redirect=true.
For additional insights, you may check out this article: Invite a contractor to add their own 1099 tax info.
If the issue persists, there would be a need for us to locate your client's account on a secured environment and verify its subscription type. I'd recommend letting your client contact our Customer Care Team.