Error - 'no email address configured for recipient name' when submitting a form for approval

In the first instance, check the named user has an email address in their user record in System, Security, Users. If this is not populated then update the record with the correct email address.
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If the user's email is in place, or updating it does not solve the problem, then Support will need to run some scripts on the database. Therefore please raise a new case online and reference the title of this article and please include details of the form affected.