As part of the security changes happening in power platform, the plugin configurations will need to be signed if we are going to be using the new managed identity feature, without the need of having to use app registrations, secrets and storing those in a manner that is not secure, and requiring renewal. Part of the process is that the plugin will need to be signed with a certificate. The instructions for this process is found at https://learn.microsoft.com/en-us/power-platform/admin/set-up-managed-identity