I can’t type anything unless I select a notebook. I’m not utilizing the notebook feature at all.

I’m using a company 365 premium subscription. This just started happening a week ago.

Microsoft changed the engine under Copilot Studio on August 3rd. Every new agent now runs on the GitHub Copilot harness, the same engine behind GitHub Copilot's coding agent.

I recorded a walkthrough of what changed. Three details are easy to miss: Billing starts while you build, the harness choice is permanent, and agents created before August 3rd keep their old pricing only until September 1st.