Hey @Fabrizio1,
Happy to learn that you have solved the login step.
Regarding the error you mentioned, have you taken a look at the document mentioned in the article before you started testing?
I’m not a mobile developer but your error makes me think that your app doesn’t trust your development certificate.
That document contains instructions on how to configure HTTPS support, and specifically how to bypass the certificate security check for development purposes.
Let me know if this helps.