Use this script to generate a fresh key in your local Magnolia CMS author instance and update it in your public instance.
Clone this repository to your local machine:
git clone git@github.com:alexmacarthur/generate-magnolia-key.git
Install & link it with yarn:
yarn install --production
yarn link
You need Magnolia CMS running locally on your machine.
Run generate-magnolia-key in your terminal. After that, you'll be able to successfully publish and delete pages from your local author instance to your local public instance.