Iss claim not valid Keycloak

Question

I use the keycloak service to login my web app. Use as a backend spring with oauth 2.0 security. When I go to make a request with postman using the bearer token obtained from keycloak it gives me an error 401 and also in the text of the answer next to the www-Authenticate entry it tells me:

Bearer error="invalid_token", error_description="An error occurred while attempting to decode the Jwt: The iss claim is not valid", error_uri="https://tools.ietf.org/html/rfc6750#section-3.1" .

How could I solve this problem?

Answer 1

Spring config value must be exactly the same as iss claim value. Even trailing slash, if any, is important.

Do as @BenchVue wrote in comment: open one of access-token JWTs in jwt.io, copy iss claim value and paste it in spring conf.