External users in mail enabled group can't access app audience

[MarkPalmberg]

We have an audience in an app that's available to external clients who are members of a mail-enabled security group. But they can't access the app. The users in the group in question are able to access content in a different audience in the same app (permissioned by a non-mail enabled security group), so it appears the issue is with the mail-enabled group itself. Is there a checklist somewhere for creating mail-enabled groups that I can refer to to confirm all the necessary steps have been taken to grant members the access they need? Thanks!

[v-yetao1-msft]

Hi @MarkPalmberg 

So the external user can access the app when he is in security group ? But I tested with mail enabled group , the external can also access the app . Can you talk me through your procedure in detail?

Best Regards,
Community Support Team _ Ailsa Tao
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