The Azure App Configuration library version 1.0.1 caused client side connection issues. I shared the message in my original post back on 6/23. On 6/29, I posted about a temporary work around to this problem. I was notified late yesterday that version 1.1.0 of the Azure App Configuration library has been officially released. You can grab the latest version by either visiting the official @azure/app-configuration NPM page or by running npm i @azure/app-configuration from a command line within your project.

Azure App Configuration and Feature Flagging