This code snippet restores capabilities 'edit_user' and 'delete_user' if they were blocked by a third-party plugin.

Restore capabilities 'edit_user' and 'delete_user'.php

<?php

/**
 * This code snippet restores capabilities 'edit_user' and 'delete_user' if they were blocked by a third-party plugin.
 *
 * You can add this code to the end of the file functions.php in the active theme (child theme) directory.
 * 
 * Ultimate Member documentation: https://docs.ultimatemember.com/
 * Ultimate Member support (for customers): https://ultimatemember.com/support/ticket/
 *
 * @author  Ultimate Member support <support@ultimatemember.com>
 * @since   2020-11-18
 * @see     #45381
 */

if ( function_exists( 'UM' ) ) {

	function um_map_meta_cap( $caps, $cap, $user_id, $args ) {
		static $permissions = array();

		$index = array_keys( $caps, 'do_not_allow' );
		if ( $index ) {
			$index = current( $index );
			if ( empty( $permissions[$user_id] ) ) {
				$role = UM()->roles()->get_priority_user_role( $user_id );
				$permissions[$user_id] = UM()->roles()->role_data( $role );
			}
			$p = $permissions[$user_id];

			switch ( $cap ) {
				case 'edit_user':
				case 'edit_users':
					if ( !empty( $p['can_edit_everyone'] ) ) { // role setting Can edit other member accounts?
						if ( empty( $p['can_edit_roles'] ) ) {
							unset( $caps[$index] );
						} elseif ( is_array( $p['can_edit_roles'] ) && isset( $args[0] ) && is_numeric( $args[0] ) ) {
							$urole = UM()->roles()->get_priority_user_role( $args[0] );
							if ( in_array( $urole, $p['can_edit_roles'] ) ) {
								unset( $caps[$index] );
							}
						}
					}
					break;

				case 'delete_user':
				case 'delete_users':
					if ( !empty( $p['can_delete_everyone'] ) ) { // role setting Can delete other member accounts?
						if ( empty( $p['can_delete_roles'] ) ) {
							unset( $caps[$index] );
						} elseif ( is_array( $p['can_delete_roles'] ) && isset( $args[0] ) && is_numeric( $args[0] ) ) {
							$urole = UM()->roles()->get_priority_user_role( $args[0] );
							if ( in_array( $urole, $p['can_delete_roles'] ) ) {
								unset( $caps[$index] );
							}
						}
					}
					break;
			}
		}

		return $caps;
	}

	add_filter( 'map_meta_cap', 'um_map_meta_cap', 99, 4 );
}