Unable to find an algorithm for key

I´m using the[ Oauth 2.0](https://developer.intuit.com/app/developer/qbo/docs/develop/authentication-and-authorization/oauth-2.0) flow process with Python SDK, in the step 12 using the _get_bearer_token_ function i get the error shown in the image. I make the peticion in a instance made in node JS and the redirect URl is located in a lambda function made in python. All the credentials are the same (sandbox).
Following the steps this error appears and i verified all the steps and anythings works. I update the python-jose library used by intuit but nothing has worked. Anyone has seen this error? Any hint /advice.