Error: Key already added to dictionary " domain \ username "

Question

Hello Community
    In Sharepoint 2013 Server I created a managed account.
    But when I try to create the Search Service application
with that managed account as the configurable an error message
appears stating some to the effect that:
     Key already added to dictionary "<domain>\<username>" : ... "<domain>\<username>"
    Since I couldn't use that same "<domain>\<username>", I created
another new managed account and used that new managed account to create
the Search Service and it worked.
    The question is why do I get that error stating:
        Key already added to dictionary "<domain>\<username>" : ... "<domain>\<username>" ?
    Thank you
    Shabeaut

Answer 1

Is it specific to some particular managed account or for all the managed accounts ?
Does that managed account exists twice ?
Have a look at the following links if it gives you any pointers.
https://tayzarminn.wordpress.com/2013/03/21/getting-error-like-item-has-already-been-added-key-in-dictionary-while-removingediting-managed-account-in-sharepoint-2010/
http://sharepointgoose.blogspot.in/2012/08/getting-error-item-has-already-been.html
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