How to reinstall Apple Developer

matthew499 wrote:

@MrHoffman, I am already logged on to my new Apple ID in System Preferences.

I know what you asked.

Transfer the Mac and macOS install to the new Apple ID, as was linked. Migrate your content in as part of either the initial macOS setup, or migrate the content from backup later as part of using the Migration Assistant app.

This is migrating the content, and not restoring the backup. Restoring the backup will restore the association of the Apple ID of what’s installed.

If you decide to wipe macOS and reload and migrate content later, then pick a different initial login name as your first created user name. If you don’t do this, and if you try to pick the same name you want to use and then try to migrate the same user name and contents later, you’re headed for trouble with the resulting collisions. Pick a different name for the initial admin creation than what you really want to use.

I’d suspect you’ll want to re-install macOS. What you’re trying to do is a whole pile of work, unless you “transfer” your Mac to your new Apple ID as another owner. That’s this: What to do before you sell, give away, or trade in your Mac - Apple Support