My iPad Air has the iOS 15 beta profile installed but it isn't

beta profile ios 15Download iOS 15 Beta Confuration profile for your iPhone and iPad to install iOS 15 or iPadOS 15 Without Developer account or PCiPhone models with a USB-C port include all iPhone 15 models and newer. ... introduced in version 2.7 of the specification. iOS 18 supports RCS Universal Profile 2.4.