permalinks structure

Hi guys,

I am trying to make some adjustments toward permalink structure, so it uses {users}{first_name-last_name} instead of {users}{nicename}. I think I found the right filter to adjust and here is my code:

// Add this function to your theme's functions.php file or your plugin file.
function custom_bbp_get_user_profile_url( $url, $user_id, $user_nicename ) {
	// Get the user data
	$user_info = get_userdata( $user_id );

	// Check if user info is available
	if ( $user_info ) {
		// Get first name and last name
		$first_name = isset( $user_info->first_name ) ? $user_info->first_name : '';
		$last_name = isset( $user_info->last_name ) ? $user_info->last_name : '';

		// Create custom user_nicename as "First Last"
		$custom_nicename = trim( $first_name . ' ' . $last_name );

		// Return the URL with updated user_nicename
		return str_replace( $user_nicename, sanitize_title($custom_nicename), $url );
	}

	// If user info is not available, return the original URL
	return $url;
}

// Hook the function into the filter
add_filter( 'bbp_get_user_profile_url', 'custom_bbp_get_user_profile_url', 10, 3 );

The structure of the URL got changed as expected, however I am getting 404 not found. I’ve re-saved permalinks to refresh the cache, but it didn’t help. Any ideas where to look?

Thanks!