Thank you for letting us know. Glad to hear that the issue is solved.

We're going to mark this thread as resolved. Feel free to open a new topic if you have further questions.

For anyone in the future that faces this problem.

This kind of issue is usually caused by a conflict with other plugins or the active theme.

We recommend deactivating all plugins and switching to a default WordPress theme. Then check how the filter works. After that, activate your plugins and theme one by one, checking after each activation to find the problem maker. 

I deactivated the plugin and nothing changed. Also cleared all the cache and still it redirected to the author page and not the custom page set with the filter.

We've tested the hook code multiple times, and it works as expected. Please try deactivating the profile plugin you're using and check whether the redirection functions correctly.

Also, make sure to clear all caches before testing.

I'm not sure what's unclear in what I wrote that stirred this question. I wrote clearly:

"On clicking on a user comments profile picture/name it redirected me to:

https://www.domain-name.com/author/user-name/"

Meaning, it redirects to the default author page and not the homepage as it should have ("return home_url();").

Could you please confirm whether the WordPress URLs are being redirected to the correct page as intended?

Thanks!

I tried using it, but it didn't work. Even just with a dummy link like:

add_filter('wpdiscuz_profile_url', function ($profile_url, $user) {
return home_url();
}, 10, 2);

On clicking on a user comments profile picture/name it redirected me to:

https://www.domain-name.com/author/user-name/