single.cs

app.UseOpenIdConnectAuthentication(
    new OpenIdConnectAuthenticationOptions
    {
        ClientId = clientId,
        Authority = aadInstance + tenantId,
        PostLogoutRedirectUri = postLogoutRedirectUri,
        AuthenticationType = "AADC"
    });

app.UseOpenIdConnectAuthentication(
    new OpenIdConnectAuthenticationOptions
    {
        ClientId = clientIdGov,
        Authority = aadInstanceGov + tenantIdGov,
        PostLogoutRedirectUri = postLogoutRedirectUri,
        AuthenticationType = "AADG"
    });