so I looked into this & found the problem. The buttons were disabled due ...

so I looked into this & found the problem. The buttons were disabled due to Drupal environment-related issues.

In my case, /tmp directory was not writeable and upgrade_status module's DeprecationAnalyzer class was not able to create deprecation_testing.neon file. Hence the module was keeping the buttons disabled. If you want to identify your environment-related issues, You will have to look for error logs.

This issue is actually a feature for scenarios where the Drupal environment is configured correctly.