https://i.instagram.com/api/v1/users/{account_id}/info/

__a=1

From email:

Tried to use your IGmonitoring system for accounts with cyrillic/utf8
tags... and had some troubles - the system skips to auto-add any tags
which consist of non-latin characters.

Some research shows that problem is here:

vendor/jakim-pj/ig/src/Text.php

class Text
{

    public static $usernamesPattern =
'/(?:@)([A-Za-z0-9_](?:(?:[A-Za-z0-9_]|(?:\.(?!\.))){0,28}(?:[A-Za-z0-9_]))?)/i';
    public static $tagsPattern =
'/(?:#)([\p{L}0-9_](?:(?:[\p{L}0-9_]){0,28}(?:[\p{L}0-9_]))?)/i';

after change to

public static $tagsPattern = '/#(\w+)/u';

seems to work more correct...