View Agent Builder Agents in Copilot Studio

I am having difficulty viewing the Agents I have created using MS365 Copilot Studio Agents Builder (let's call them 'Agent Builder Agents') within Copilot Studio and wondering if anyone else is having this problem? 

I am following the recommended steps for creating, sharing and using Agent Builder Agents, but I then have no visibility of these within Copilot Studio.  However, if I create the Agent within Copilot Studio (let's call them Copilot Studio Agents), then I do not have this limitation. 

Is this because my Copilot Studio environment is not configured properly or is this an inherent limitation of Agent Builder Agents?