These tutorials target Micronaut Framework 3. Read, Guides for Micronaut Framework 4.

auth0

Learn how to create a Micronaut application and secure it with an Authorization Server provided by Auth0.
Learn how to use Client Credentials Flow between Micronaut microservices with an Authorization Server provided by Auth0.
Learn how to use Client Credentials Flow between Micronaut microservices with an Authorization Server provided by Amazon Cognito.