'Why cant I deploy on an App with certification on an lower Api version?

I'm trying to deploy my App on another phone. I already installed the cert on the new phone and I'm still facing this problem.

java.security.cert.CertPathValidatorException: Trust anchor for certification path not found.

The first phone had android 9 and the new one has android 6.



Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source