Confirmation token is invalid
If you, as a publisher, are contacted by a new user indicating that they've encountered a confirmation token is invalid error, follow the procedure below:

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Navigate to the Users module by clicking the Users link in the Sales dropdown menu.

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Find the user record in question.
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Verify that the user is confirmed.

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If the user is not confirmed, click the Confirm User link at the top of the page. Note: The link won't be visible if the user is already confirmed.

NOTE: If the user was confirmed, they should have no problem logging into the site. They simply clicked the Confirm my account link twice. Note: The confirmation email describes this potential error at the bottom of the message.
