Spring Boot Feign client - interceptor not working - spring-boot

Question

I have feign client interceptor which adds Auth header (bearer token being fetched by RestTemplate). If the server responds with 401 (expired token) I want to reauthenticate and try the request again but the interceptor is not getting triggered 2nd time.
Interceptor code:
#Override
public void apply(RequestTemplate requestTemplate) {
if (AuthenticationService.bearerToken == null)
authenticationService.authenticate();
requestTemplate.header(AUTHORIZATION, BEARER_TOKEN_PREFIX + AuthenticationService.bearerToken );
}
Error decoder:
#Override
public Exception decode(String s, Response response) {
FeignException exception = feign.FeignException.errorStatus(s, response);
switch (response.status()) {
case 401:
authenticationService.authenticate();
return new RetryableException(response.status(), exception.getMessage(), response.request().httpMethod(), exception, null, response.request());
case 500:
throw new BadActionException(s, response.reason());
default:
break;
}
return exception;
}
Client config class:
#Bean
public RequestInterceptor requestInterceptor() {
return new RequestInterceptor (authenticationService);
}
#Bean
public RestClientDecoder restClientDecoder() {
return new RestClientDecoder(authenticationService);
}
Feign client:
#FeignClient(value = "server", url = "${server.base-url}", configuration = RestClientConfig.class)
public interface RestClient {
#PostMapping("api/test/{id}/confirm")
void test(#PathVariable Long id);
}
Side note: is there built in interceptor for authentication other than oAuth and BasicAuth? The server I am communicating with has simple jwt auth with expiration.