How do I fix the “Unauthorized User API Key” Error in Cursor?

[Stellaol]

I keep seeing the “Unauthorized User API Key Error in Cursor" when trying to run queries. I’m wondering if this means my API key is invalid or has expired. Has anyone else encountered the “Unauthorized User API Key” Error in Cursor and found a way to fix it? I’m looking for step-by-step solutions to get Cursor working properly again.

 

[AngelinaFi]

Same here. It’s been happening for two days now and it’s making the IDE basically useless. I’ve checked my Anthropic dashboard and the key is definitely active, so I have no idea why I keep getting the Unauthorized User API Key Error in Cursor.