Discussion on: The Complete Guide to Next.js Authentication

Hi I have tried to add Facebook as a federated identity provider and I also want to carry on using the default withAuthenticator and associated UI. The first strange thing I notice is that there is a new button a the top of my login panel but it says "Sign in with AWS". When I click I get taken to a new login screen with Facebook at the top. When I try to login in though there is a URL error in the debug on the following API call:
cognito-identity.us-east-1.amazona...
Response error: 400
{"__type":"ValidationException","message":"1 validation error detected: Value '{cognito-idp.us-east-1.amazonaws.com/us-east-1_XXXXX=}' at 'logins' failed to satisfy constraint: Map value must satisfy constraint: [Member must have length less than or equal to 50000, Member must have length greater than or equal to 1]"}

I appreciate any directions on how to start debugging. I have tried googling but cannot find where to start. I can see the user has been added to the AWS Cognito user pool in AWS Console. I upload some screen captures of the initial flow.
dev-to-uploads.s3.amazonaws.com/up...
dev-to-uploads.s3.amazonaws.com/up...