Thanks for getting back to us, @chandanat. The steps shared by my peer @MariaSoledadG would point you in the right direction in contacting us without logging in to your QuickBooks account. 

Let me guide you through: 

1. Click this link: https://help.quickbooks.intuit.com/en_US/contact.
2. Select QuickBooks Desktop as your product, then click Continue as a guest. 
3. Select your QB Desktop version, then click the Search for something else button. 
4. Enter "error message when accessing the Workforce" in the Ask us anything box, then click Search. 
5. Click Start a Message. 

A pop-up box will then appear at the bottom left of your screen. Enter all necessary details, then hit Submit. 

For future reference, read through this article: View your paychecks and W-2s in QuickBooks Workforce. It helps you and your employees learn about accessing pay stubs online. 

Let me know if you have additional questions, @chandanat. I'd be here to help.