For Nova 12 Series and Pura 70 Series
There are two steps in total. Take Instagram as an example as follows:
Step 1: Download MicroG from AppGallery > Allow the permission and login accounts > Install the apps you wish, i.e. Instagram (If the App is installed, kindly backup the data and reinstall the App).
Step 2: Go to Settings > Notifications> Search for WhatsApp > Always enable Allow notifications.
Step 3. Find the WhatsApp page in the mobile phone's recent tasks, and press and pull down until the lock icon appears in the upper right corner.