Cnmaestro Guest Access does not authenticate Smart Phone users

I have configured guest access on cnmaestro onpremise to connect copilot E 500
I have allowed only voucher access and also configured a captive portal.
But only laptop clients can get redirected to the login page.
For smart phone clients, they are connected without authentication

What could be the problem

What about certificate? We implement lets encrypt and it works just fine

Where do I find the license part

Lets Encrypt is free