I download the sample at:
https://auth0.com/docs/quickstart/webapp/aspnet-core/02-login-embedded-lock
Unzip, load in to Visual Studio 2017
Check the Client Secret, Client Id and Domain.
Run the app.
Click the Login button (top right)
![alt text][1]
The Auth0 lock is correctly displayed.
![alt text][2]
Enter my credentials.
I get the following error. (The actual error message contains more information but has shows keys that I don’t want to display on a public forum)
An unhandled exception occurred while processing the request.
SecurityTokenInvalidSignatureException: IDX10503: Signature validation failed. Keys tried: 'Microsoft.IdentityModel.Tokens.X509SecurityKey , KeyId: