WhatsApp Flags Huawei P Smart 2021 with Unofficial App Warning

I have been unable to use the WhatsApp application properly on my Huawei P Smart 2021 phone for about 4 months. When I try to open the app, I get a warning telling me to "install from an official site," and sometimes my messages fail to send altogether.

I ported my number to a different carrier and tried downloading and installing WhatsApp through my Google account, but I still get the exact same warning. When I download it via the Huawei App, the application does not work correctly, and the issue persists. Since I do not have the budget to buy a new phone, I want this problem resolved on my current device.

I wrote to both Huawei and WhatsApp via email and smart assistants, but my issue still has not been fixed. I demand support to permanently resolve these warnings and message delivery failures so I can use WhatsApp stably and seamlessly.