How can a user that I have invited sign on?

Hey there, @pbpatter.
 
There's an open investigation with regards to adding users. Our product engineers are aware of this issue, and are now working hard to fix this the soonest.
 
I recommend giving our Customer Care Team a call to add your account details to the list of affected users. This way, they can pull up your account in a secure environment and sign you up to receive email updates as soon as they become available. 

To contact QuickBooks Online Support:

1. Click the Help icon.
2. Hit Contact us.
3. Enter "invite users" in the description, then click Let's talk.
4. Choose Get a callback.

To ensure we address your concern on time, check out our support hours.

Feel free to go back to this thread if have further questions. I'll always have your back.