Unable to retrieve document from: '[PII is hidden

I’m try to build the demo application and when I click on sign-in I get the following error message,

Please help

An unhandled exception occurred while processing the request.

IOException: IDX20807: Unable to retrieve document from: ‘[PII is hidden. For more details, see https://aka.ms/IdentityModel/PII.]’. HttpResponseMessage: ‘[PII is hidden. For more details, see https://aka.ms/IdentityModel/PII.]’, HttpResponseMessage.Content: ‘[PII is hidden. For more details, see https://aka.ms/IdentityModel/PII.]’.

Check MS documentation on how to enable PII is hidden to reveal the URL, that will help troubleshooting