Modulus/Exponent-based encryption wrong outcome

[itm-platform]

Hi there,
I need to RSA-OAEP encrypt the following string
"{\"credentialData\":[{\"name\":\"username\", \"value\":\"TenantTwo\"},{\"name\":\"password\", \"value\":\"moss1KLOH5pont-bah\"}]}"

using the following exponent/modulus

exponent = 'AQAB';
modulus = '0R3Mmpn2LSnGiuFPMOldR/9hySiSsWKs01Oue+ecg0ZLKMepXArJ3gmCngBdQxcsocTXwyW725J/EDrIdgJ5DhMSVPevyvg3yiLKKFVFgG3q7Hbxf7NMgXHcXg3dgELO4TXHhRjrTzjlfnC2gaUHBGDteUJ0rc94zkvYUYPtAFJ8M4xSyoflRTeVxMgFAQRgo0C/pTZXh3Pr6YFBcQF2FoicpqT7jRUG0rQAJ7Cw1N61YXKU/ss+ofEywYXBKa/jrXxBhOOhTpgEkNbpxbDb4KAWxTv4CahMDsYIP6dH9+86pRfWisG9O5SYkUbHl+oUKdnwfW7SNvzYA1zcHXDSTQ==';

The goal is encrypting credentials to create a data source in a power bi gateway.

The correct result (obtained using a PowerShell script or C#) is this one

dbjZOiaP+lL6G+irfS+jSQOMuE4+PdgcBUTMVBe1294mnPtTHq224nySjA1KB7Vn+M16T0PrwFsHGZ3/tDQy3enJFf8Yun7MnDoGx7tWeqwg0wimS6scZoiUJ31pZ896ZhatOus3+QvJjBgS6sVktX50BTu66QaIqZ0DJLSfy/bh58lKGZ8O4YoI3UCDO/vtv4fUuOB+0qUHhUmPDyu/v6ydjwOfUF4tFE1QNSKMbrWSqhGZFAXxaoB1OVBAC+TzOEiXar5iq8AZ5hkiNoyeGmWHXXY7K3P+skbYUe8D6vxDpSkLd7Q0U8GcHuEwkrIMaeeW9LL6qpnPv6nl45piTg==AADFHJUs5X180+lTIZ6TiMtk/DDXVPLHuR/3R4UvIqESRe0JajaYj94Z/UAsblnO6ECmOss2ppWXqad8gv9JZEgIfxgHrNrhr40W0Eq1neMSJ6dcoOY7QczycNdiBjb4guHy5M+y2zO7o6UaQMtI+ZiQWC4pOYTHNgstzMhjF8uijOxwMaL7WrsAoj1FtiGaUCiC5FUJuBaxtYs+2L3szysq

Now, what I get from node-rsa is quite different

Cxlwo+i38IxfBvNvFmxFAlcdIAVM8QVQ40/+8xNMalLnmgaFf3A9w0TxXmjLWuZbNFAHSZzf3/XGSGQpo+bjZJMDooqoe/exXS5uF+EXS9m3EOOaY81wK7E6TR/BpNHoNnZeP/ng64usrTRucvmTTCj4tRjWt8y7XxE13zjceLPtKLwdo6dsdzdYfIiqFa8/1a15XPwq1pv6KuAWNY9ELzr5C2XPs8b7rOwggjmBL7hdIiDEVzW1SFeTTykbeHB7G9jlrcIiZR+7Pcq3CW4xTSMzUsrG1Ku1vg1Qo4fjpZJKNfE0q/VwMkRfBO3MLD2mf5KTTg/zO7rrz2xedUDmTQ==

This is the code I used

const encryptCredentials = () => {
    // using https://stackoverflow.com/questions/56961746/power-bi-api-post-datasource-errors-with-dmts-invalidencryptionalgorithmerror
    const nodeRSA = require("node-rsa");
    const credentials = "{\"credentialData\":[{\"name\":\"username\", \"value\":\"TenantTwo\"},{\"name\":\"password\", \"value\":\"moss1KLOH5pont-bah\"}]}";

    const exponentString = 'AQAB';
    const modulusString = '0R3Mmpn2LSnGiuFPMOldR/9hySiSsWKs01Oue+ecg0ZLKMepXArJ3gmCngBdQxcsocTXwyW725J/EDrIdgJ5DhMSVPevyvg3yiLKKFVFgG3q7Hbxf7NMgXHcXg3dgELO4TXHhRjrTzjlfnC2gaUHBGDteUJ0rc94zkvYUYPtAFJ8M4xSyoflRTeVxMgFAQRgo0C/pTZXh3Pr6YFBcQF2FoicpqT7jRUG0rQAJ7Cw1N61YXKU/ss+ofEywYXBKa/jrXxBhOOhTpgEkNbpxbDb4KAWxTv4CahMDsYIP6dH9+86pRfWisG9O5SYkUbHl+oUKdnwfW7SNvzYA1zcHXDSTQ==';

    const key = new nodeRSA();
    // key.generateKeyPair(); // tried this to upgrade to 2048

    const modulus = new Buffer(modulusString, 'base64');
    const exponent = new Buffer(exponentString, 'base64');

    const pubKey = key.importKey({ n: modulus, e: exponent }, 'components-public');

    const encrypted = pubKey.encrypt(credentials, 'base64');

    return encrypted
}
console.log(encryptCredentials())

In several posts, they say it may be due to a 512-key rather than 2048, but couldn't find a way to fix it.

Any ideas?