Hi there, LH1993.
I'm here to ensure you'll able to send invites to your employees into the Workforce center.
Some requirements are needed so you can invite employees, these are:
Once verified, try to send an invite again and make sure to turn on ActiveX controls in Internet Explorer.
For further guidance about the process, see this article: Set up QuickBooks Workforce for your QuickBooks Desktop.
See this future reference, in case your employees will access W-2s in Workforce.
Let me know if you have any follow-ups or other questions. I'm always here to help. Wishing you a good one.