Why is UCMA telling me my session is not established when I add a contact?

Recently I found myself in the situation where I need to add a contact to a user using UCMA  but did not care about what contacts currently existed.  I did the standard plumbing to create a CollaborationPlatform and register the user, then added the contact with the following code. userEndpoint.ContactGroupServices.EndAddContact(this.Subscriber.ContactGroupServices.BeginAddContact(contactUri, null, null)); To my surprise,…

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