Administrators are unable to authenticate with elevated privilege accounts, but the other administrator accounts work fine.
Users must qualify for the User Store Filter. Testing some user accounts succeeds, where problem accounts do not succeed, despite both being members of the same User Store Filter group.
Problem was identified as other administrator accounts in a different OU container in Active Directory that does not reside under the "Base DN" of the User Filter.
Solution - Either of the following options will resolve this issue:
Help with configuring the User Filter and Base DN settings can be found in this Knowledge Base article: https://knowledge.broadcom.com/external/article?articleId=163791