multi.cs

app.UseOpenIdConnectAuthentication(
    new OpenIdConnectAuthenticationOptions
    {
        ClientId = clientId,
        Authority = $"{aadInstanceGov}common",
        PostLogoutRedirectUri = postLogoutRedirectUri,
        AuthenticationType = "AADC",
        TokenValidationParameters = new System.IdentityModel.Tokens.TokenValidationParameters
        {
// instead of using the default validation (validating against a single issuer value, as we do in line of business apps), 
// we inject our own multitenant validation logic
ValidateIssuer = false,
        },
    });

app.UseOpenIdConnectAuthentication(
    new OpenIdConnectAuthenticationOptions
    {
        ClientId = clientIdGov,
        Authority = $"{aadInstanceGov}common",
        PostLogoutRedirectUri = postLogoutRedirectUri,
        AuthenticationType = "AADG",
        TokenValidationParameters = new System.IdentityModel.Tokens.TokenValidationParameters
        {
// instead of using the default validation (validating against a single issuer value, as we do in line of business apps), 
// we inject our own multitenant validation logic
ValidateIssuer = false,
        },
    });