Not all Azure subscriptions are available in Visual Studio 2015
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I found a way to get around this inside the Azure Portal. You can move subscriptions between different directories. Alas, Visual Studio has issues where subscriptions exist in different directories with different credentials now (it used to just register everywhere as far as I assume).
I know how to move these subscriptions to the old portal. If you are logged in, you select the last menu item on the left called "Settings". There you have a "Subscriptions" page. You can select a subscription and then click "Edit Catalog" at the bottom. There you can change the directory for this subscription.
If you move all your subscriptions to one directory and enter that directory in VS, everything will show up.
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