Exchange 2013 - External contacts are not displaying when view the Distribution Group

Good afternoon Experts,

We have a few Distribution Groups setup with External contacts that are not displaying when viewing the group in OWA or Outlook.

These Groups are restricted so only higher level employees are able to email the groups. When logging into OWA with an account that has permission to email the group, only the email addresses that in our company are displaying as being in the group, but the external contacts are not displaying
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AmitIT ArchitectCommented:
Check the expansion server for this DL. If it is set it to some server, change it to null.
JenlorAuthor Commented:
The Expansion server for this DL is already set to null.
JenlorAuthor Commented:
Also, In Exchange 2010, our mail contacts were hidden from the Address Lists and still able to be viewed within the groups.

After testing more in 2013, The contacts are still hidden, but not showing in the groups.

When the contacts are not hidden, they are showing in the groups.

Thank you,
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AmitIT ArchitectCommented:
You need to unhide them to make it work.
JenlorAuthor Commented:
Any possible way to hide them from specific users?
AmitIT ArchitectCommented:
You can create address book policies. Read this:

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