Hi there, journeyinc.

If you're using the QuickBooks Desktop version and the invite page doesn’t load, let's make sure of the following:

• Update your QuickBooks Desktop to the latest release version
• Get the latest payroll tax table update
• Log in as QuickBooks administrator

Once done, check out this link to turn on ActiveX controls in Internet Explorer. 

Otherwise, check this article to fix ActiveX control installation issues in Internet Explorer for QuickBooks Online. Please make sure that you are logged in as a Windows admin.

Get back to me if you need more help with QuickBooks. Thanks.