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i have more than one. How do I identify all of them. How do I know which one to use by device? I just got a new computer and set I up but can’t get in as it says it’s attached to different Id
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Read this support article about Apple ID Frequently Asked Questions --> https://appleid.apple.com/faq
"How many Apple IDs do I need?
Just one. Use the same Apple ID everywhere you sign in to ensure that all your Apple services and devices work together seamlessly and you can access your personal content from all your devices."
So the best approach would be to cut back on the number of IDs you have so you don't have to keep a long list of what works with what. There is no list of what IDs you have unless you maintain one yourself.
A brand new computer should not be associated with any ID. You should take it back to the store or whoever sold it to you and ask them to prepare the computer correctly. That's outlined in this support article --> What to do before you sell, give away, or trade in your Mac - Apple Support