Play Store not allowing to publish beta with target sdk 23

Question

I try to download the release as a beta version, but every time it shows it is an error

It is forbidden to use devices that previously used M permissions (target SDK 23 and above) on APKs that use the old permissions style (target SDK 22 and below). This happens when you change version 28 (target SDK 23) to version 25 (target SDK 21).

used by gradle im currently

compileSdkVersion 23
buildToolsVersion '23.0.3'
defaultConfig {
    minSdkVersion 15
    targetSdkVersion 'N'

    versionCode 29
    versionName '1.12.5'
    multiDexEnabled = true
}

see attached image. I also add M permissions in my application, and I still can’t publish the beta. Why? Please help me solve this problem.

thank