Hello, @lancpay.

I want to ensure you get the support you need, so I'm going to stick with you until we're able to find a resolution to the issue. If you'd provide me with a bit of information so I can get the best solution. 

Could you tell me more about what QuickBooks product you're using? (QuickBooks Online, QuickBooks Desktop).

When you attempt to invite the employee to have access to Workforce, is there a specific error? 

I'll continue researching possible solutions based on the information that I currently have and will be looking for your reply.