windowshelp Said:
"What are the steps to remove an Apple ID from a Mac mini and add a new Apple id"
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Transferring a Mac to a New Apple ID:
What happens when you try?
Is this a Previously-Owned Device?
If so, disassociate this from an account. This is probably associated to a different Apple ID. Have the original user disassociate it from their account. Go Here: What to do Before you Sell, Give Away, or Trade in your Mac - Apple Support. The seller should have known better.
You Likely have to Wait Up to 90 days:
- Go Here: See and Remove your Devices that Are Associated with Apple ID Purchases - Apple Support
- Scroll to: Use a Mac or PC to see or remove your associated devices
- As it Reads: "you might need to wait up to 90 days to associate the device with a different Apple ID."