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Jwt.io does not recognize Auth0 signing certificate for RS256

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I am trying to manually create a JWT for my Auth0 app using jwt.io with RS256 but I keep getting the error “Invalid signature”. When I pop-open the browser console it appears it only accepts a private key rather than the signing certificate provided by Auth0:

TypeError: “pkcs8” must be PKCS8 formatted string

As I understand it, I can not retrieve a private key for RS256 from Auth0. How can I create a RS256 JWT using jwt.io with the Auth0 provided signing certificate and JWKS URL?

I have tried pasting the string without the “— BEGIN CERT…” but can not get it to work.

Any help would be great

Thanks
Simon

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