I was reading a tutorial for obtaining an Apple Developer ID Installer certificate in order to distribute my .pkg outside the Mac App Store. However in the Certifcates/add page I'm am unable to see the required certificate (Developer ID Installer). Do I need to get some extra permissions to view this option or was it removed/moved to somewhere else?

i am creating a app on "appmysite" while it runs its build test an error message pops up saying build failed. "it seems your app build has encountered an issue. the certificate used to generate the uploaded provisioning profile does not match the uploaded certificate." I understand why its saying it because the uploaded certificate had to be uploaded as ".p12". The certificate in the provisioning profile is made of ".cert". I am using a apple mac book and a xenovo windows computer. Im simply trying to figure out how to put the ".p12" certificate into the provisioning profile? whenever i go to my developer account and try to create a new provisioning account with the new ".p12" certificate. The only options that pop up for me to select are only the certificates that are in ".cert" form. I've tried exporting through "key access" and they show up in my files but no way to transfer to my developer account to combine it with a provisioning account. Any help is greatly appreciated, this is literally the only thing keeping my app from being ready for submission to review. ive been stuck on this for 3 days.

I'm trying to enable Music Kit for my key however I keep seeing this message "There are no identifiers available that can be associated with the key" even though my identifier has music kit enabled. Can someone help out with this?