I see, thanks for clarifying! In that case, you can add the user’s email in the Access Token by creating a rule. Go to Auth pipeline > Rules in your Auth0 dashboard. Click + CREATE RULE and select Empty rule. Paste in this rule, replacing the namespace with your app’s URI (a namespace is required so that the claim does not collide with others):
function(user, context, callback) {
const namespace = 'https://myapp.example.com/';
context.accessToken[namespace + 'email'] = user.email;
callback(null, user, context);
}