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You can send another invitation to the contractor, @userchristopher-rodr.
Let's isolate the error you're having by resending the email invitation to your contractor. Once they received the email, try to let them create the account using the link of the new email invitation.
See this article for more information: Invite a contractor to add their own tax info.
You can also refer to this article for more information on how to add, edit and inactivate contractors
Feel free to leave a reply if you need any further assistance in setting up your contractor's profile. I'd be around to assist. Have a great day!