entityId

The identifier of the entity that owns the mailbox.

The identifier can be UserId or Group Id, Username or Groupname, or email.

• Entity ID: 12345678-1234-1234-1234-123456789012, r-0123456789a0123456789b0123456789, or S-1-1-12-1234567890-123456789-123456789-1234

• Email address: entity@domain.tld

• Entity name: entity