I have subscribed for two newsletters (MSE, SO), it is listing in my Edit Profile & Settings -> Newsletters tab.
But the same is not listing in my Network Profile - subscriptions tab.
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I've just pushed a build that removes this link. Newsletter subscription management has all moved to the network sites. You can manage all your newsletters in the Newsletters section of your profile.
In the coming weeks/months the remainder of the subscription management will be removed from stackexchange.com and migrated to the Q&A sites instead.