Unable to use monthly fast requests quota

Hello,
I have 500 monthly fast requests quota available as I have taken Cursor Pro subscription.

But, when I am trying to use this available quota for Claude Sonnet, it throws error as in the attached image below:

Someone, please help me with this issue.

Hey, didn’t you add your API key? This error occurs sometimes, usually a repeated request to the model solves the problem. Does this error occur often?

Previously, I have added Claude API Key. But, now I removed it and turned it off. I still get this error. Yes, this error occurs everytime. I have tried repeatedly calling the API, but the error persists (without having my own API key).

It might be cached, try deleting it by following this guide: