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You'll want to go to your Audit Log and view the deleted invoice from there. Let me guide you how.
In your QuickBooks Online (QBO) account:
To learn more about how the Audit Log works, you can check this article for reference: Use the audit log in QuickBooks Online.
Also, I recommend checking this article to learn some tips on managing your users in your QBO account: Add, delete, or change user access.
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