bitcoin core – How can I import a multisig address to my wallet?

I’m stuck on this problem since yesterday and I don’t get how to fix it. How do I import a multisig address to my bitcoin-cli wallet?

I am currently doing this:

public function generateMultisigWallet($serverPubkey, $initiatorPubkey, $partnerPubkey) {
    $multisig = $this->request('createmultisig', [2, [$serverPubkey, $initiatorPubkey, $partnerPubkey], 'p2sh-segwit']);
    $multisig = json_decode($multisig)->result;

    if(!isset($multisig->address)) {
        return [false, '', ''];
    }

    $this->importMultisig($serverPubkey, $initiatorPubkey, $partnerPubkey);

    return [true, $multisig->address, $multisig->redeemScript];
}

public function importMultisig($key1, $key2, $key3) {
    $descriptor="sh(multi(2,".$key1.','.$key2.','.$key3.'))';
    
    $descriptorInfo = $this->request('getdescriptorinfo', [$descriptor]);
    $descriptorWithChecksum = json_decode($descriptorInfo)->result->descriptor;

    $importData = [
        [
            'desc' => $descriptorWithChecksum,
            'timestamp' => 'now',
            "label" => "my_multisig_wallet"
        ]
    ];

    $result = $this->request('importdescriptors', [$importData]);

    var_dump("RESULT IS :");
    var_dump($result);
    return $result;
}

The problem is, I cannot get around the Error Message “Cannot import descriptor without private keys to a wallet with private keys enabled” for it, if I do not import the address I cannot get unspent UXTOs nor walletnotify works – does anybody have a solution for this? Would be extremely thankful if somebody could provide assistance.