Content-Security-Policy (CSP) is a browser feature that limits what origins your page can interact with. With CSP, the browser will reject connections made to non-approved origins (e.g. if a vendor's script was hijacked or code was injected via an XSS attack).
In addition to the policies that your site needs without Cohere, there are 2 directives that you need to include with Cohere:
connect-src: wss://service.cohere.so https://*.cohere.so
Content-Security-Policy would be:
Content-Security-Policy: child-src 'self' blob:; script-src 'self' https://static.cohere.so; connect-src wss://service.cohere.so https://*.cohere.so