frag.jetzt | The name of app | Frontend Framework library

Currently I´m trying to integrate JWT Authentication in an existing Spring Boot Webflux Project. As a template I used this medium article: https://medium.com/@ard333/authentication-and-authorization-using-jwt-on-spring-webflux-29b81f813e78.
If I put the Annotation @EnableWebFluxSecurity inside my WebSecurityConfig the following error occurs:

The bean 'conversionServicePostProcessor', defined in class path resource [org/springframework/security/config/annotation/web/configuration/WebSecurityConfiguration.class], could not be registered. A bean with that name has already been defined in class path resource [org/springframework/security/config/annotation/web/reactive/WebFluxSecurityConfiguration.class] and overriding is disabled.

Basicaly it´s the same error as in this post Error creating bean named `conversionServicePostProcessor` when using spring-boot-admin-server but the answers didn´t help for me and I can´t comment on answers.

In the previous post two solutions are mentioned that didn´t work for me. Removing the websocket dependency didn´t help and setting "spring.main.allow-bean-definition-overriding=true" seems to override my own Configuration, because my route /auth/login/guest is still responding 401.

Here is my WebSecurityConfiguration: