Access denied | ourtenant.auth0.com used Cloudflare to restrict access

Help
1

I have created a regular web application using Username-Password-Authentication and with “Authorization code” grant type enabled.
I have created and deployed an action to insert custom claim (Between ‘Start’ and ‘Complete’ for a Login Flow, which works and shows the correct information in results when I test

{
“name”: “https://ourapp.com/user_role”,
“target”: “idToken”,
“type”: “SetCustomClaim”,
“value”: “Developer”
}

However, when I test the application it doesn’t return an id_token in the payload

https://ourtenant.auth0.com/authorize?response_type=code&client_id=obscured&redirect_uri=https://ourapp.com/openid-connect/developer_login&scope=openid%20profile%20email&state=ABCD

I also can see the error:
Access denied | ourtenant.auth0.com used Cloudflare to restrict access

How to unblock this?