Let me share some information about deleting customers, Annikempson.
In QuickBooks Online, inactivating customers also means deleting them from the customer list.
It means that we're unable to delete inactive customers permanently. They're already deemed deleted the moment they're inactivated.
I'll include this reference so you can learn more about how to add, edit, delete, or merge customers in QuickBooks Online: Add and manage customers in QuickBooks Online.
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