title: OnTokenValidated event not triggered
body: <p>What I'm trying to do is add a claim after authentication. The following example of triggering an <code>OnTokenValidation</code> event not actually working.</p>
  <p>I'm using <code>Microsoft.Identity.Web</code> to authenticate on Azure AD. That part works! How can I register events using <code>AddMicrosoftIdentityWebAppAuthentication</code> to add custom claims</p>
  <pre><code>services.AddMicrosoftIdentityWebApiAuthentication(_configuration);
  services.Configure&lt;MicrosoftIdentityOptions&gt;(OpenIdConnectDefaults.AuthenticationScheme, options =&gt;
              {
                  options.Events = new OpenIdConnectEvents
                  {
                      OnTokenValidated = ctx =&gt;
                      {
                          var claims = new List&lt;Claim&gt; {
                              new Claim(ClaimTypes.OtherPhone, &quot;somevalue&quot;)
                          };
                          ctx.Principal.AddIdentity(new ClaimsIdentity(claims));
                          return Task.CompletedTask;
                      },
                  };
              });
  </code></pre>