Describe the bug
When using withAuthenticator with a customized SignIn component, the migrate users lambda is not triggered. Instead the error "User does not exist" is given. The same migration lambda (with minor tweaks, e.g. user pool ID) currently functions well on a separate PHP backend using the hosted UI.
Expected behavior
The migration lambda should be triggered when signing in with a user that exists in the legacy directory.
Here are the areas that seem to be problematic:
https://github.com/aws-amplify/amplify-js/blob/master/packages/auth/src/Auth.ts#L339
https://github.com/aws-amplify/amplify-js/blob/master/packages/auth/src/Auth.ts#L1396
L1405 doesn't seem to be checking for existence and triggering the lambda in its absence. Does Auth support any of the Cognito workflow triggers?
Hi @jkeys-ecg-nmsu
This is interesting, as far as I know, all the triggers are called by the cognito service itself, not client-side by the sdks (like aws-amplify or amazon-cognito-identity-js).
Do you see the same behavior if you don't customize the component?
Hey @manueliglesias, the same behavior exists when components are not passed into withAuthenticator.

@manueliglesias I think the migrate users trigger requires "USER_PASSWORD_AUTH" flow. Is this what Amplify uses, or is there a way to configure it to use this instead of SRP auth?
@manueliglesias I think the migrate users trigger requires "USER_PASSWORD_AUTH" flow. Is this what Amplify uses, or is there a way to configure it to use this instead of SRP auth?
Amplify by default uses 'USER_SRP_AUTH', and you can override this, see https://aws-amplify.github.io/docs/js/authentication#manual-setup
Amplify.configure({
Auth: {
// ...
// OPTIONAL - Manually set the authentication flow type. Default is 'USER_SRP_AUTH'
authenticationFlowType: 'USER_PASSWORD_AUTH'
}
});
@manueliglesias I'm not certain when the authentication flow type needs to be set, but this code in my App.js (before declaration of App class) does not successfully set the authentication type:
Amplify.configure(aws_exports, {Auth: {authenticationFlowType: "USER_PASSWORD_AUTH"}});
I've also tried manually setting it with Auth.configure(), both before and after the above declaration, and it has no effect. This is the preview header to Cognito with this code:

But when I add this line:
Amplify.configure(aws_exports, {Auth: {authenticationFlowType: "USER_PASSWORD_AUTH"}});
Amplify.configure({Auth: {authenticationFlowType: "USER_PASSWORD_AUTH"}})
I'm finally able to get the password sent over the wire, but now Cognito is dumping back a 500 error with a malformed (HTML injected) error message:
2019-02-18T17:53:20.298Z cc027150-eef8-4bfb-8d19-870387b14aba
{
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"errorType": "StatusCodeError",
"stackTrace": [
"new StatusCodeError (/var/task/node_modules/request-promise-core/lib/errors.js:32:15)",
"Request.plumbing.callback (/var/task/node_modules/request-promise-core/lib/plumbing.js:104:33)",
"Request.RP$callback [as _callback] (/var/task/node_modules/request-promise-core/lib/plumbing.js:46:31)",
"Request.self.callback (/var/task/node_modules/request/request.js:185:22)",
"emitTwo (events.js:126:13)",
"Request.emit (events.js:214:7)",
"Request.<anonymous> (/var/task/node_modules/request/request.js:1157:10)",
"emitOne (events.js:116:13)",
"Request.emit (events.js:211:7)",
"IncomingMessage.<anonymous> (/var/task/node_modules/request/request.js:1079:12)"
]
}

So I guess I was able to find a solution to getting Amplify to use USER_PASSWORD_AUTH, but then the migration lambda -- which is the same lambda that is triggered for our backend CRM when signing up new users, and works fine -- is dumping a ridiculous error message back to the client.

Is this something I should take up with the Cognito team, or do you have any insight on this?
I'm closing this for now while I play around with it, let you all know how it goes.
Hi,
Good day.
Any updates? I'm using the angular auth component.
In my view I added
And I have manually enabled the flow in the App clients of the Cognito User Pool to USER_PASSWORD_AUTH.
But the lambda function does not get triggered.
Is this a known issue with User Migration? Thanks.
Regards.
Jarrett
@jarrettj @manueliglesias I think you forget to include a snippet of your view, but: I think we resolved this by ensuring that Auth (and then Amplify) are configured at the top of the program. At one point I had code like this IIRC:
Amplify.configure(aws_exports, {Auth: {authenticationFlowType: "USER_PASSWORD_AUTH"}});
Amplify.configure({Auth: {authenticationFlowType: "USER_PASSWORD_AUTH"}})
But this "fix" worked b/c our app was ignoring race conditions and we just got lucky. Once we configured Amplify.configure/Auth.confgure as literally the first statement in our application's entry point (as defined by webpack config in this instance) in index.js the issue was resolved.
I don't remember how I fixed the HTML dump. *shrugs* But it looks like you're not experiencing this anyway.