The URI that was specified for a user is invalid. This typically means that the given URI was not prefaced by "sip:", or ...

The URI that was specified for a user is invalid.  This typically means that the given URI was not prefaced by "sip:", or didn't contain a '@' symbol.  This attribute has been ignored, and the users URI will not change until the URI is corrected.
URI Active Directory attribute name:%1
URI Active Directory attribute value:%2