Hi OpeningDay,
Do you and your wife share any devices. If so, that may be linked to the issue you're experiencing. Try removing any devices that are not your personal devices using this guidance from Check your Apple ID device list to find where you're signed in - Apple Support. Have your wife check and do the same.
"Use your iPhone, iPad, iPod touch, or Apple Watch to find where you're signed in
- Tap Settings > [your name], then scroll down.
- Tap any device name to view that device's information, such as the device model, serial number, OS version, and whether it's a trusted device that can be used to receive Apple ID verification codes. The information might vary depending on the device type. You might need to answer your security questions to view device details."
If you share any AirPods, Beats etc. check for those as well. The following is from Remove a device from Find Devices on iCloud.com - Apple Support.
"Remove a device from the Devices list
If you’re not using a device, you can temporarily remove it from your account so it doesn’t show up in your Devices list. When the device goes online again, it reappears in the list if it has Activation Lock turned on (for an iPhone, iPad, iPod touch, Mac, or Apple Watch) or is paired with your iOS or iPadOS device (for AirPods or a Beats product).
- Turn off the device, or put AirPods in their case. The device must be offline before you can remove it from the Devices list.
- In Find Devices on iCloud.com, click All Devices, then select the device you want to remove.
If you don’t see All Devices, it’s because you’ve already selected a device. Click the name of the current device in the center of the Find Devices toolbar to see the Devices list, then select a new device.
3. Click Remove from Account."
Take care.
