See all option in inbox Stack Exchange portal link redirects to top questions and answers and not to inbox related stuff (I guess it should be activity or something like that).
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This is fixed. If you're not logged into stackexchange.com, the
?tab=inbox ("see all") link now redirects you to the login page. After logging in, you'll be redirected back to your inbox.
If you already have a stackexchange.com account, global auth should kick in, and the login/redirects will happen automatically.