Unable to Access My WhatsApp Account Despite Installing the Official App

I'm facing a serious issue with my WhatsApp account that I urgently need resolved. Every time I try to log in, a message appears telling me I need to download the official WhatsApp app. I've already installed, uninstalled, and reinstalled the official app multiple times, ensuring it's the latest version. I even restarted my phone and tried accessing it on a different device, but the problem persists. This has become extremely frustrating, and I'm urgently seeking help to resolve this issue. WhatsApp team, please address this promptly – I need access to my account immediately!