I added money from a gift card to my apple account why can’t I add it to my Apple Cash? And how can I fix this problem

This article explains the different kinds of cards Apple uses and has links on how to redeem them and what can be purchased with each kind. Click on the link --> What type of gift card do I have? - https://support.apple.com/HT204199

The Apple Support article: Check your Apple ID balance - https://support.apple.com/HT202359 says:

"About unused Apple ID balance

You can't redeem or return Apple Gift Cards, App Store & iTunes Gift Cards, or unused Apple ID balance for cash, except as required by law. If your jurisdiction allows for refund of redeemed gift balances, you can contact Apple Support [ https://support.apple.com/contact ] to request a refund."