With the release of iOS 14.3 this issue should be resolved now. Please make sure to update your iOS device if you are still experiencing below named issue.
Posted Dec 15, 2020 - 09:08 UTC
If you are attempting to set up an S2-enabled product on an S1 system, you will not be able to complete the process using a device running iOS 14.2. We strongly recommend setting your product and system up on the S2 app, which is our platform for the future. If you need to set up your product on an S1 system, you can use a device running an earlier version of iOS or an Android device.