Redirection for the User Pages Add On when you do not want to set the Top Level Page in Add On settings.

my_custom_user_page_template_redirect.php

<?php
/**
 * Redirection for the User Pages Add On.
 *
 * Note: This is only needed when you do not want to set the Top Level Page in Add On settings.
 * If you have set a Top Level Page, the Add On has native logic for redirection.
 */
function my_custom_user_page_template_redirect() {
	// Exit early if not on the control page.
	if ( ! is_page( 'clients' ) ) {
		return;
	}

	// Get the fallback redirection URL.
	global $pmpro_pages, $current_user;
	$no_user_page_redirect_url = home_url();

	if ( ! empty( $pmpro_pages['levels'] ) && get_post_status( $pmpro_pages['levels'] ) === 'publish' ) {
		$no_user_page_redirect_url = get_permalink( $pmpro_pages['levels'] );
	}

	// Get the logged-in user's User Page, if assigned.
	$user_page_id = is_user_logged_in() ? get_user_meta( $current_user->ID, 'pmproup_user_page', true ) : false;

	// Redirect to the user's page if it exists and is published.
	if ( ! empty( $user_page_id ) && get_post_status( $user_page_id ) === 'publish' ) {
		wp_safe_redirect( get_permalink( $user_page_id ) );
		exit;
	}

	// Redirect to the fallback URL.
	wp_safe_redirect( $no_user_page_redirect_url );
	exit;
}
add_action( 'template_redirect', 'my_custom_user_page_template_redirect' );