One or more phone numbers failed to normalize. %1 total numbers failed to normalize. They are listed in the text file: '%2' ...

One or more phone numbers failed to normalize.

%1 total numbers failed to normalize.  They are listed in the text file: '%2'
Cause: One or more phone number attributes in Active Directory contained text that could not be normalized.  Normalization rules may be accessed through Powershell.  Refer to the documentation for a description of how to modify them.
Resolution:
Either modify the normalization rules and make sure they cover all cases found in your Active Directory deployment or fix the invalid phone number(s) in the Active Directory record(s).
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