Hey, thanks for the report.
Can you try these steps:
- Restart Cursor
- Open a different project/workspace and try pinning there
- Open DevTools (Help > Toggle Developer Tools), try clicking Pin again, and send any console errors here
Also, it’d help to know if pin worked for you before, or if this is your first time trying it.
A similar report came up about a month ago Can't PIN the chat, but without more info it’s hard to tell what exactly is breaking.