Amazon Cognito - User Pools - App Integration - App Client Hosted UI URL Issues with CORS

Question

Our web application was working fine for the last two months.  This morning without any code changes we found when the web application calls a dialog window of the Hosted UI URL for authentication, that dialog window loses its references to the opener.  So we can no longer ball back to the opener self.opener to set the parent variables or call functions.  We have found that if that dialog window is in the same domain that it has no issues.   We have also found that if we calla dialog window to a third party outside of AWS it does NOT lose reference to the opener.    However when calling this link https://prod-intellias-azure.auth.us-east-2.amazoncognito.com/oauth2/authorize? or any other Hosted UI link for authentication it breaks.   This has to be a cors issue losing reference to the parent however we can not figure out how it breaks over night?

Answer

For this question, I am going to recommend that you open a Support Case with [AWS Premium Support](https://support.console.aws.amazon.com/support/) to allow us to investigate this issue further.

When you open the support case please attach a [.har file](https://repost.aws/knowledge-center/support-case-browser-har-file) of the error occurring. Premium Support will use the information included in the .har file(such as the Request IDs) to investigate this issue further.

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Please note HAR files can capture sensitive information, such as user names, passwords, and keys. Be sure to remove any sensitive information from a HAR file before you attach it to the support case AWS Premium Support.

Amazon Cognito - User Pools - App Integration - App Client Hosted UI URL Issues with CORS

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