Where Is My Apple ID Password Stored In Keychain?

Keychain: I want to know why my Mac will not automatically fill in my Apple ID password when I am downloading an app from the app store, nor will does it seem to store my Apple ID password, such that I can find it when I do a search of Keychain,and, finally, when I create a new password, it does not offer to save it. I assume this is a security feature, but what a pain.
I am trying to do this in two specific instances: accessing iCloud to find my phone and today, prior to downloading an app from the app store, I needed my apple ID password. The same thing happens on the iphone. If Touch ID doesn’t work (and for me, my fingerprints seem to fade over time), I have to manually enter my password, which does not seem to be stored anywhere on the phone.
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Phyllis Capanna