High impact feature parity issue between Legacy Tokens and NAA - DDLs are not supported by Graph API.

[liamtim]

During the monthly office community call today January 8th, we were advised to post discrepancies between what is available today and what will no longer be available once NAA is enforced to this repo.

Your Environment

Effects all Outlook Environments.

Expected behavior

Dynamic Distribution lists and O365 dynamic groups should be queryable by Graph API.

Current behavior

Dynamic Distribution lists and O365 dynamic groups can not be queried by Graph API.

Provide additional details & Context

Our O365 Outlook Web Add-in allows our customers to expand the “To field contacts using EWS or Graph API. This allows our application to send individual emails to each unique recipient nested within the DL for the purpose of internal communications. A user can place any type of Microsoft group or contact in the “To” field. Depending on which list types the customer uses, we guide them to a Microsoft API that supports the type. Below is a table outlining which list types are supported by Graph vs EWS:

Type of List/Group	Graph	EWS
Static Distribution Lists	Supported	Supported
Mailbox Contact Group	Supported	Supported
Security Group	Supported	Supported
Universal Group	Supported	Supported
Dynamic Exchange Group	Not supported	Supported
0365 Dynamic Group	Not supported	Not supported
0365 Group	Supported	Supported
Distribution groups with hidden membership	Supported	Not supported

A large percentage of our customers who rely on Microsoft Distribution lists for audience targeting are using Dynamic Exchange Groups (DDLs), moving to NAA will result in our application having the inability to provide customers with the value provided today as the EWS option from the table above will no longer be supported.

This is a significant and breaking gap in functionality that we believe needs to be addressed before NAA tokens are disabled for O365 tenants.