Updating Apple ID
I just bought the 11 Pro Max and I have a notification badge in settings saying to update my Apple ID. Well I put in my passcode for this phone then it takes me to the next page saying put in the passcode for the Other iPhone. I've only temporarily used an iPhone years ago (for about a week) while waiting on my phone to arrive and then gave it away. I have no idea what the passcode on that phone was. So I have no idea what to do now. How bad is resetting my encrypted data? What will that actually delete, seeing as I've never REALLY used an iPhone?
iPhone 11 Pro Max, iOS 13