Hi @Muhamed_Cicak ,
Have you looked over the documentation for how to do local development on MFEs? You’ll essentially bind-mount your custom MFE directory. On that note, pay attention to the note at the bottom of the section: Note: the name of the bind-mount folder needs to match the name of the repository word-for-word. If you've forked an MFE repository with a custom name, be sure to change the name back to ensure the bind-mount works properly. In other words, your fork of the authn repo needs to be named frontend-app-authn.
In your tutor plugins folder, create a custom plugin using these instructions.
Assuming you’ve enabled the plugin and done a tutor config save, you’ll need to rebuild the authn-dev image: tutor images build authn-dev, and then you can try tutor dev launch.
Hopefully you’ll be able to sort it out. Please do a search for bind-mounting MFEs/customizing MFEs in this forum. There have been other forays into documenting/understanding this, but it’s all spread out and hard to find in once place, plus it’s further confused by the fact that the process seems to have changed from version to version.