Tried out to overwrite the portal slug and set it to 'app' as shown here: https://github.com/WPManageNinja/fluent-community-docs/blob/master/code-snippets.md#modify-portal-url-slug
But it doesn't really work solid for me.
404 all the time, once it worked shortly, then again not.
Our site is hosted on Rocket.Net, Nginx I think
Make sure you re-save the permalink settings.
Shahjahan Jewel Oh man, you're right, rookie mistake! 😀
Now it seems to work