In accordance with the routine, Apple will lock Sign for older versions after releasing new iOS updates to encourage users to update to the latest operating system version. Therefore, it's not surprising that users can't downgrade to iOS 16.1 and 16.1.1.
Apple locks signing for iOS 16.1 and iOS 16.1.1 on iPhone, iPad
iOS 16.1 is a major update that adds support for iCloud Photo Library and Live Activities, while iOS 16.1.1 is an update that fixes some lingering issues from the previous version.
iOS 16.1.2 will soon be replaced by iOS 16.2, a major update currently in testing and expected to be released next week. iOS 16.2 will introduce features such as Advanced Data Protection for iCloud, the Freeform app, Apple Music Sing, and several other new features.
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