BizTalk 2013 hosted WCF Service fails because it could not load Microsoft.BizTalk.Interop.SSOClient

I’m in the midst of migrating my customer from BizTalk 2009 to BizTalk 2013, migration being distinct from upgrading in that I’m installing BizTalk 2013 from scratch on newly built servers.  Everything installed well, except when I tried to access any BizTalk generated WCF service, I would get an error.  Browsing to the URL on the…

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