Get-DynamicDistributionGroup | %{$ddg= $_;
$usrs = @($ddg.AcceptMessagesOnlyFromSendersOrMembers | select-object name, distinguishedname, @{n="mode";e={ "acceptonly"}});
$usrs += @($ddg.RejectMessagesFromSendersOrMembers | select-object name, distinguishedname,@{n="mode";e={"reject"}});
$usrs | select-object *, @{n="DDGname"; e={$ddg.name}}}
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It means the group requires authentication to send to it. This should fix it.
Set-DynamicDistributionGro
You should not need to play with the other delivery restrictions.
Chris