As I have stated in the title, the link to the profile will always return a 404 if I have connected the UM-Plugin since I am not using the user management from wpforo.
What can I do?
First try to delete all kind of caches of your cache plugins.
Then delete forum cache, go to Dashboard > Forums > Dashboard and click the following two buttons:
- Delete Users Cache
- Delete All Caches
And make sure the Profile Page option is set UM in Forums > Settings > Features Tab.