user migration not working properly (sign in trigger is not triggered)

[flkrnr]

I have successfully configured the sample identity broker. Next I followed the guide to migrate users from my existing cognito user pool with this provided lambda function.

It seems like to work perfectly fine with the password reset trigger source (UserMigration_ForgotPassword) after applying the needed AdminGetUser policy to the migration lambda function. But I’m suck at the standard flow of triggering the function with a normal sign in (UserMigration_Authentication). It seems like the lambda trigger isn’t even triggered as intended. Is this a bug or is it possible that I have any configuration problem on my side?

Worth Noting: when I’m creating a new client with AWS hosted UI for the same user pool as the identity broker, the migration trigger works as intended with sign in (UserMigration_Authentication) and forget password (UserMigration_ForgotPassword)

Also In the new Cognito UI the settings for triggers can be found under "User pool properties":

TODO

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1. update Docs for new Cognito UI

thanks in advance for any helpful comment or feedback ✌️