missing username in oidc intercept

[Jim Fox]

We have a very simple intercept class that includes this:

   public boolean testSlack(@Nullable final ProfileRequestContext input) {
         username = usernameLookupStrategy.apply(input);

where the usernameLookupStrategy is the CanonicalUsernameLookupStrategy

It works fine with SAML logins, but always returns null when activated 
during an OIDC login.

Does the oidc plugin require a different lookup class?

Thanks,

Jim