CommunicationIdentifierKind Enum  
Communication Identifier Kind.
For checking yet unknown identifiers it is better to rely on the presence of the raw_id property, as new or existing distinct type identifiers always contain the raw_id property. It is not advisable to rely on the kind property with a value unknown, as it could become a new or existing distinct type in the future.
Fields
| COMMUNICATION_USER | 
| MICROSOFT_TEAMS_APP | 
| MICROSOFT_TEAMS_USER | 
| PHONE_NUMBER | 
| UNKNOWN |