Hacked phone
I have had items added to my calendar saying that my phone is at risk of being hacked or has been hacked
iPhone 12 Pro, iOS 14
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If running iOS 13 or earlier versions, check: Settings - Passwords & Accounts - Accounts - Any rogue entries here? If so, delete the rogue account.
If running iOS 14, check: Settings - Calendar - Accounts - Any rogue entries here? If so, delete the rogue account.