I was able to get it working.
//"ClientRootAddress": "http://localhost:4200/", //"CorsOrigins": "http://localhost:9902", "ServerRootAddress": "https://[mycompany]angulardemo.azurewebsites.net", "ClientRootAddress": "https://[mycompany]angulardemoclient.azurewebsites.net", "CorsOrigins": "https://[mycompany]angulardemoclient.azurewebsites.net,https://[mycompany]angulardemo.azurewebsites.net"
.SetIsOriginAllowed((host) => true)