I tried using Graph API/Explorer and was able to get all the members of a distribution list but I could not figure out how I could use this within SharePoint Designer to populate a field with the DL's members.
Issue: Outlook blocks any incoming mail from an external source (i.e. @sharepointonline.com) to an internal distribution list. An announcement workflow sends an email (once its approved) to the entire division. SP 2013 workflow gives error message and SP 2010 workflow actually 'sent' the email to a distribution list but Outlook blocked it.
Is there a work around? I was thinking maybe if I could extract the members of the distribution list then put these members on a 'to' field. Although, not sure if I'll encounter any limitations as to how many email addressed the field can hold. Or, use Graph API with SharePoint Designer like I would with REST?