node.js imap not connection to ionos

Question

I am using the "imap" package for connection to ionos server

const imap = new Imap({
        user: 'xxxxx',
        password: 'xxxxx',
        host: 'imap.ionos.com',
        port: 993,
        tls: true
});
...
imap.connect();

But I always get back this error, which is not really much.

Error: authentication failed
    at Connection._resTagged (/usr/src/app/node_modules/imap/lib/Connection.js:1502:11)
    at Parser.<anonymous> (/usr/src/app/node_modules/imap/lib/Connection.js:194:10)
    at Parser.emit (node:events:390:28)
    at Parser.emit (node:domain:475:12)
    at Parser._resTagged (/usr/src/app/node_modules/imap/lib/Parser.js:175:10)
    at Parser._parse (/usr/src/app/node_modules/imap/lib/Parser.js:139:16)
    at Parser._tryread (/usr/src/app/node_modules/imap/lib/Parser.js:82:15)
    at TLSSocket.Parser._cbReadable (/usr/src/app/node_modules/imap/lib/Parser.js:53:12)
    at TLSSocket.emit (node:events:390:28)
    at TLSSocket.emit (node:domain:475:12) {
  type: 'no',
  textCode: undefined,
  source: 'authentication'
}

I tried with the port 465 and 587 aswell and set tlsOptions rejectUnauthorized to false, but no effect. Same issue occurs on gmail. Anyone has ever experienced this?