At the moment n8n supports only RSA for JWKS which is outdated and slow.
If the npm package jwks-rsa would be swapped with GitHub - panva/jose: "JSON Web Almost Everything" - JWA, JWS, JWE, JWT, JWK, JWKS with no dependencies using runtime's native crypto in Node.js, Browser, Cloudflare Workers, Electron, and Deno. this would provide a wider algorithmic support.
Here is the respective GitHub Issue: JWT auth not working · Issue #1211 · n8n-io/n8n · GitHub