OpenDkim - PHPMailer - Failure OpenDkim

my dkim configuration was working just fine. Im working with an email marketing app, pretty simple, normally i used to send the campaign with a Sender ID that is my domain company, and for the From Email, the customer email. I signed the dkim wih my sender id and my domain company and everything was working just fine but for some reason now im getting dkim failure, idk if anything changed on PHPMailer or in Gmail rules:

Maillog message from my smtp Postfix server

Jul 15 10:24:34 companydomain opendkim[183343]: 286315A1BCF: no signing table match for '[email protected]'
Jul 15 10:24:34 companydomain opendkim[183343]: 286315A1BCF: key retrieval failed (s=dkim, d=companydomain.com): 'dkim._domainkey.companydomain.com' query failed

Gmail Original Text

DKIM-Signature: v=1; d=companydomain.com; s=dkim; a=rsa-sha256; q=dns/txt; t=1689431315; c=relaxed/simple; h=Date:To:From:Reply-To:Subject:Message-ID:X-Mailer:MIME-Version:Content-Type; [email protected]; z=Date:Sat,=2015=20Jul=202023=2010:28:35=20-0400 |To:[email protected] |From:=3D?UTF-8?Q?Instituto_Pedag=3DC3=3DB3gico_de_Caracas?=3D=20<[email protected]> |Reply-To:[email protected] |Subject:Bienvenido=20Cliente |Message-ID:<[email protected]> |X-Mailer:PHPMailer=206.8.0=20(https://github.com/PHPMailer/PHPMailer) |MIME-Version:1.0 |Content-Type:multipart/alternative=3B=20boundary=3D"b1=3D_MyZhklUNeLD68Ba 0maXIEDVYBtTGcBKu0tCwv4NEyPU"; bh=oyle56yHSYBUkyZZ/Zuf0g/9jNuIcgHbPw9t44NuqaI=; b=hJzqH6LJfmUkHffAdUc/qUgwHiDNLSPk6tD916gleLGKAN96s2iPrTPvqNIZaAd1/jw30xu5D eRX2/J22Sq3cdFky3r2l2uVQeWNdfZMYWzrTcd4pFOz04mjMrVQsDl0wynr7I6a+tGCOXfZvo q+O7IRmkyry4ocOciaw/etKp0=

This is my code but like a said, in the code and server nothing changed, and everyhing was wokring just perfect:

I check that all content was all good.

$this->mail->DKIM_domain = $domainId;
$this->mail->DKIM_private = __DIR__ . "/../assets/smtp/" . $domainId;
$this->mail->DKIM_selector = 'dkim';
$this->mail->DKIM_passphrase = '';
$this->mail->DKIM_identity = $sender;

For some reason the selector changed to default. How could I know it? just chekcing the file /etc/opendkim.conf

##  Defines the name of the selector to be used when signing messages.
Selector        default

So I changed the next line

$this->mail->DKIM_selector = 'dkim';

to

$this->mail->DKIM_selector = 'default';