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Example Telgram Bot URL : https://api.telegram.org/bot1234567:AAEExQ1o9K1w-abcdefghijklmn/

Example Chat ID : @channelname or -12345678

If you get this error:

Content cannot start with the following characters: = - + @

Edit file: include/class.validator.php Search this function

    static function is_formula($text, &$error='') {
        if (!preg_match('/^[^=\+@-].*$/s', $text))
            $error = __('Content cannot start with the following characters: = - + @');
        return $error == '';
    }

Line 223 Remove characters @-