Request failed with Internal server error 500 on accessing the Cloudfront url from browser, but the lambda logs have error 400

Hi Team,
I have set up Cognito OAuth to be in front of a CloudFront distro that uses an S3 bucket as the origin.Accessing the CloudFront distro I get the following error from the Lambda@Edge function:

"error": {
"message": "Request failed with status code 400",
"stack": "Error: Request failed with status code 400\n at createError (/var/task/node_modules/axios/lib/core/createError.js:16:15)\n at settle (/var/task/node_modules/axios/lib/core/settle.js:17:12)\n at IncomingMessage.handleStreamEnd (/var/task/node_modules/axios/lib/adapters/http.js:269:11)\n at IncomingMessage.emit (events.js:412:35)\n at IncomingMessage.emit (domain.js:475:12)\n at endReadableNT (internal/streams/readable.js:1333:12)\n at processTicksAndRejections (internal/process/task_queues.js:82:21)"
},
"logName": "auth",
"date": "2022-12-15T10:06:07.472Z"
}