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Users are not authenticated when an identity source provides the login name in 'User Principal Name' format "user@domain"
Symptoms
  • When an identity source provides the login name in 'User Principal Name' format (e.g., "user@domain") and the default login attribute is defined for this identity source (usually sAMAccountName), users can not authenticate.
Cause

A 'User Principal Name' formated name will not match the content of the login attribute sAMAccountName and vice versa.
In order to keep the default login attribute definition and allow users to authenticate successfully, split the 'User Principal Name' (e.g., username@domain) into the user name and domain according to the position of '@'


Solution
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