If you can't open Copilot in the Microsoft Edge Sidebar, you're not alone. People trying to use the AI tool in Edge may be met with a message stating Copilot is unavailable in that part of the browser during a migration to a new experience.

Several members of our team ran into the message, as have some Reddit users. Here's what the browser says when you try to use Copilot in the Edge Sidebar:

It may take a few days and require restarting Edge. You will be able to use Copilot here and see all your chat history and settings once the migration completes. Until then, please use the new Copilot web experience copilot.com"

Microsoft does not explain what the "new experience" is within the message shown in Edge. The message likely references Microsoft's broader rollout of a unified Copilot experience across the web, apps, and other platforms, though Microsoft does not specifically mention the Edge Sidebar in its support documentation.

The notification suggests user data is being moved as part of the transition, stating chat history and settings will be available once the migration completes.

It also seems odd that the migration stops Copilot in the Sidebar from working at all until the new experience is available. I'd prefer to see Microsoft complete the migration in the background then ship the finished version with an Edge update. Instead, people who rely on Copilot in the Edge Sidebar have to jump to a different tab or use the dedicated Copilot app.

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