Hi @Developer_T,
Take a look at this demo application which uses spring boot 1.5 and see if it helps - https://github.com/oktadeveloper/okta-spring-boot-oauth2-migration-example/tree/master/oauth2-demo-1.5
Also, your issue is with “Authorization” and not “Authentication”. Your angular front-end is trying to make an API call to the spring boot backend, it’s not “Authorized” because of an invalid/non-existent access token. Hopefully, you can use the linked demo application for your usecase.