Hi there, ldiamond21.

Thank you for visiting the QuickBooks Community. I'll be providing information on how the invitation link sent from your employer works in QuickBooks. Then, ensure you'll be able to access and finish the W9 form.

Your employer can use their QuickBooks Online account to send you an invite to fill out your Form W-9. You can sign in from QuickBooks Self-Employed and fill in the form and send it back directly. Since you're unable to process this due to a message stating the invitation expired and you need to talk to a live agent, I recommend reaching your employer and requesting to resend the invitation link. Please know that the invitation expires after 24 hours and contacting support isn't necessary.

Once done, you can now begin to fill out your W-9 so you'll be able to view and print your 1099. You can click this article to see further details on how to complete the process and how it works: Fill out a W-9 and view your 1099-MISC in QuickBooks Self-Employed.

Lastly, you may refer to this article to view details on how you can run a report to get your federal estimated quarterly tax payment and annual tax info: Get quarterly and annual tax info from QuickBooks Self-Employed.

Please let me know if you're still having issues with W9 and you can always post to the Community if you have concerns related to QuickBooks. I'll be around to lend a helping hand. Take care and have a great weekend!