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This confirms an email is sent to the user.
The email invitation sent to the user looks like below. By clicking on 'Start I-9 Process' link, they can self register and start onboarding.
After self registration, the preparer can click on the 'I-9 Section 1' link under Outstanding Tasks to access Section 1 activity.
The user added through Invitation Personalization as well as from Form I-9 Section 1 appear in Preparer/Translator drop down in the preparer section. You can select any of these users from the drop down for completing I-9 Section 1.
Like wise, you can add maximum of five preparers from I-9 Section 1. The users invited/added in Section 1 will be added to the proxy users list in Invitation Personalization.