您的问题可能与Chrome在上一个稳定版本中引入的localStorage分区有关，请查看此链接：https://developer.chrome.com/docs/privacy-sandbox/storage-partitioning/ siteA的localStorage不再与iframe嵌入siteA中的localStorage相同。如果您使用的是Chrome扩展，您可以尝试在清单中添加host_permissions。（https：//developer.chrome.com/docs/extensions/mv3/storage-and-cookies/#storage-partitioning）

解决方案

我通过修改amplify配置并在配置中添加cookieStorage设置，成功地使我的Cognito身份验证在iframe中工作，如下所示：

Amplify.configure({
Auth: {
  userPoolId: config.aws.userPoolId,
  userPoolWebClientId: config.aws.userPoolWebClientId,
  identityPoolId: config.aws.identityPoolId,
  region: config.aws.region,
  cookieStorage: {
    domain: config.host,
    path: "/",
    expires: 365,
    sameSite: "none",
    secure: true,
    partitioned: false
  },
  oauth: {
    domain: config.aws.oauth.domain,
    scopes: [
      ...
    ],
    redirectSignIn: config.aws.oauth.redirectSignIn,
    redirectSignOut: config.aws.oauth.redirectSignOut,
    responseType: "code" // or 'token', note that REFRESH token will only be generated when the responseType is code
  }
},
Storage: {
  bucket: config.aws.bucket,
  region: config.aws.region,
  identityPoolId: config.aws.identityPoolId
}

}）;
关于partitioned: false的部分告诉amplify不要使用Chrome最新稳定版中添加的分区机制，默认情况下会激活。（partitioning in localStorage）