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MS Outlook won't stay in pinned tab

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When I log out and try to log back in it always automatically opens up in a new (non-pinned) tab...have other sites pinned and they don't do this.

When I log out and try to log back in it always automatically opens up in a new (non-pinned) tab...have other sites pinned and they don't do this.

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I can't help thinking it's related to ending up on msn.com after logging out, but I don't know the logic behind how much cross-site navigation is allowed in pinned tabs.