It seems the issue is caused by the recent Edge update affecting Copilot integration. Here’s what you can try:
Clear Edge cache and cookies: Go to Settings → Privacy, search, and services → Clear browsing data → Select cookies and cached images.
Sign out and back in: Completely sign out from Microsoft accounts in Edge, then sign back in.
Check extensions: Disable any extensions that might block scripts or pop-ups.
Try InPrivate mode: Open Edge InPrivate and see if Copilot chat works there.
Update Windows: Make sure your system is fully updated, as Copilot sometimes relies on system components.
If it still doesn’t work, contact Microsoft Edge support, they can provide a fix for this login bug.