Spring OAuth 401 exception - spring

Question

I'm building a Spring Boot application with OAuth 2.0 and OpenID. Application is an API client. When the user opens the app, he is redirected to Authorization URI (that works). After login and permission grants, he should be redirected to a callback URI (that works).
Before the next page app should take some info from API, but I get org.springframework.web.reactive.function.client.WebClientResponseException$Unauthorized: 401 Unauthorized from GET https(URL of resource).
My application yaml.
spring:
security:
oauth2:
client:
registration:
localhost-for-development-3:
provider: spring
client-id: myId
client-secret: mySecret
client-authentication-method: basic
authorization-grant-type: authorization_code
scope:
- pr.pro
- pr.act
- openid
- offline
redirect-uri: http://localhost:8080/login/oauth2/code/{registrationId}
client-name: localhost-for-development-3
provider:
spring:
authorization-uri: https://someurl.com/oauth2/auth
token-uri: https://someurl.com/oauth2/token
issuer-uri: https://someurl.com/
logging:
level:
'[org.springframework.web]': DEBUG
OAuthClientConfiguration class
#Configuration
public class OAuthClientConfiguration
{
#Bean
ReactiveClientRegistrationRepository clientRegistrations(
#Value(value = "${spring.security.oauth2.client.provider.spring.token-uri}") String tokenUri,
#Value(value = "${spring.security.oauth2.client.registration.localhost-for-development-3.client-id}") String clientId,
#Value(value = "${spring.security.oauth2.client.registration.localhost-for-development-3.client-secret}") String clientSecret,
#Value(value = "${spring.security.oauth2.client.registration.localhost-for-development-3.authorization-grant-type}") String authorizationGrantType,
#Value(value = "${spring.security.oauth2.client.registration.localhost-for-development-3.redirect-uri}") String redirectUri,
#Value(value = "${spring.security.oauth2.client.provider.spring.authorization-uri}") String authorizationUri
)
// #Value(value = "${spring.security.oauth2.client.provider.spring.issuer-uri}") String issuerUri
{
ClientRegistration registration = ClientRegistration
.withRegistrationId("localhost-for-development-3")
.tokenUri(tokenUri)
.clientId(clientId)
.clientSecret(clientSecret)
.scope("m3p.f.pr.pro", "m3p.f.pr.act", "openid", "offline")
.authorizationGrantType(new AuthorizationGrantType(authorizationGrantType))
.redirectUri(redirectUri)
.authorizationUri(authorizationUri)
// .issuerUri(issuerUri)
// .jwkSetUri("https://someurl.com")
.build();
return new InMemoryReactiveClientRegistrationRepository(registration);
}
#Bean
WebClient webClient(ReactiveClientRegistrationRepository clientRegistrations)
{
InMemoryReactiveOAuth2AuthorizedClientService clientService = new InMemoryReactiveOAuth2AuthorizedClientService(clientRegistrations);
AuthorizedClientServiceReactiveOAuth2AuthorizedClientManager authorizedClientManager = new AuthorizedClientServiceReactiveOAuth2AuthorizedClientManager(clientRegistrations, clientService);
ServerOAuth2AuthorizedClientExchangeFilterFunction oauth = new ServerOAuth2AuthorizedClientExchangeFilterFunction(authorizedClientManager);
oauth.setDefaultClientRegistrationId("localhost-for-development-3");
return WebClient.builder().filter(oauth).build();
}
}
I'm not sure what I need to look for in the Google console network tab. I see I got the "code" parameter. It's probably an authorization code. I don't see that I've received a token.
Please, if I need to provide you with more details, inform me what I need to look for, and I'll edit the question.
Also, the API provider mentioned that for issuer-uri I MUST write URL WITHOUT trailing "/" at the end. But when I do so, Spring Security will throw an exception. Is that connected to my problem maybe? I've already mentioned this problem in more detail in this post:
ClientRegistration.Builder adds trailing "/" at the end of issuer uri. How to prevent that?