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This code used to work, but now we are receiving IDX20807 exception when running from our local machine. It does work on App Service.
string stsDiscoveryEndpoint = $"https://{domain}.b2clogin.com/{domain}.onmicrosoft.com/{policy}/v2.0/.well-known/openid-configuration";
ConfigurationManager
A cloud-based identity and access management service for securing user authentication and resource access
Have you tried opening a ticket with Azure Support?
I changed it to use TLS1.2 and it's now working.
Glad that you were able to quickly resolve your issue @Carol Lai .
You were receiving an IDX20807 exception from your local machine when connecting to your B2C AD tenant. You were able to resolve your issue by using TLS 1.2.