<activity
    android:name=".wxapi.WXEntryActivity"
    android:exported="true"
    android:launchMode="singleTask"
    android:screenOrientation="portrait"
    android:taskAffinity="com.mskj.ihk.ihkbusiness.pay" />

Activity配置无误，能跳转到小程序，小程序launchApp按钮无法返回App