{
  "expo": {
    "name": "expo-login",
    "slug": "expo-login",
    "privacy": "public",
    "sdkVersion": "31.0.0",
    "platforms": [
      "ios",
      "android"
    ],
    "version": "1.0.0",
    "orientation": "portrait",
    "icon": "./assets/icon.png",
    "splash": {
      "image": "./assets/splash.png",
      "resizeMode": "contain",
      "backgroundColor": "#ffffff"
    },
    "updates": {
      "fallbackToCacheTimeout": 0
    },
    "assetBundlePatterns": [
      "**/*"
    ],
    "ios": {
      "supportsTablet": true
    }
  }
}

　　　↓

{
  "expo": {
    "name": "expo-login",
    "slug": "expo-login",
    "privacy": "public",　 // public
    "sdkVersion": "31.0.0",
    "platforms": [
      "ios",
      "android"
    ],
    "version": "1.0.0",
    "orientation": "portrait",
    "icon": "./assets/icon.png",
    "splash": {
      "image": "./assets/splash.png",
      "resizeMode": "contain",
      "backgroundColor": "#ffffff"
    },
    "updates": {
      "fallbackToCacheTimeout": 0
    },
    "assetBundlePatterns": [
      "**/*"
    ],
    "ios": {
      "supportsTablet": true
    },
    "android": {　// 追加
      "package": "expo-meomry2.com.nekotype"　// 追加
    }　// 追加
  }
}

expo login
There is a new version of expo-cli available (2.10.1).
You are currently using expo-cli 2.7.1
Run `npm install -g expo-cli` to get the latest version
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> expo-cli build:android
There is a new version of expo-cli available (2.10.1).
You are currently using expo-cli 2.7.1
Run `npm install -g expo-cli` to get the latest version
[02:01:17] An Expo user account is required to proceed.
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