Zitadel adds organization domain suffix to External Name field and is forwarded to Microsoft IdP

/**
 * Flow: External Authentication, Trigger: Post Authentication
 *
 * @param ctx
 * @param api
 */
let logger = require('zitadel/log')

function emailAsUsername(ctx, api) {
  const username = ctx.v1.externalUser.human.email + '@' + ctx.v1.authRequest.requestedPrimaryDomain;
  api.setPreferredUsername(username); 
}