The {0} list was not of the expected size. There may have been duplicate {0} given to the cmdlet, or a principal may be misspelled ...

The {0} list was not of the expected size. There may have been duplicate {0} given to the cmdlet, or a principal may be misspelled or it may contain extraneous whitespace. If the given principal is an OU or DL, verify that it matches the Active Directory DN syntax exactly.
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