📱iOS 15.7.4 - 19H321 started being signed for 12 devices
iPad Mini 4 (WiFi), iPad Mini 4 (Cellular), iPad Air 2 (WiFi), iPad Air 2 (Cellular), iPhone 6s, iPhone 6s+, iPhone SE, iPhone 7 (Global), iPhone 7 Plus (Global), iPhone 7 (GSM), iPhone 7 Plus (GSM) and iPod touch 7

📱iOS 15.7.4 - 19H321 stopped being signed for 12 devices
iPad Mini 4 (WiFi), iPad Mini 4 (Cellular), iPad Air 2 (WiFi), iPad Air 2 (Cellular), iPhone 6s, iPhone 6s+, iPhone SE, iPhone 7 (Global), iPhone 7 Plus (Global), iPhone 7 (GSM), iPhone 7 Plus (GSM) and iPod touch 7

📱iOS 16.4 - 20L497 stopped being signed for 2 devices
Apple TV 4 (2015) and HomePod mini