If you need to find or erase your device before you remove it from your trusted device list, you can use Find My iPhone. Removing a trusted device will ensure that it can no longer display verification codes and that access to iCloud, and other Apple services on the device, is blocked until you sign in again with two-factor authentication. Select a device to view the model, serial number, and other useful information, including whether or not the device is trusted and can be used to receive Apple ID verification codes. The device list shows the devices that you're currently signed in to with your Apple ID. You can view and manage a list of your trusted devices in the Devices section of your Apple ID account page. To remove a trusted phone number, click next to the phone number you want to remove. Choose to verify the number with a text message or automated phone call, and click Continue. If you want to add a phone number, click Add a Trusted Phone Number and enter the phone number. Go to the Security section and click Edit.You can update your trusted phone numbers when you follow these steps: To use two-factor authentication, you need at least one trusted phone number on file where you can receive verification codes. Keep your trusted phone numbers up to date You can manage your trusted phone numbers, trusted devices, and other account information from your Apple ID account page. I suggest using this support article to verify your trusted phone numbers, trusted devices, and other account information from your Apple ID page: Two-factor authentication for Apple ID, specifically:

If the above articles didn't help you resolve the issue, it could be an issue with Two-factor authentication for your Apple ID.

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