You need the official whatsapp to use this account android

Hi,

First of all, install all available updates for your apps and Android system.

Try clearing WhatsApp's cache and data from Settings > Apps > WhatsApp > Storage. Select Clear cache and Clear data. Uninstall WhatsApp and restart your phone. Then, reinstall WhatsApp from the Play Store and try logging again.

If the issue persists, make sure WhatsApp has access to the required permissions. Go to Settings > Apps > WhatsApp > Permissions and allow the SMS and Phone permissions. These are needed to activate a WhatsApp account.

If the issue persists, whitelist WhatsApp from battery optimization and check that there are no apps that may prevent WhatsApp from working properly. For example, if you're using a VPN, an antivirus or a firewall on your phone, try turning it off.

If the issue persists, log in to your WhatsApp account from another phone. Next, once your account is activated, go back to your main phone and try logging in again to WhatsApp.

If you still get the error message, try logging out temporarily of your Google account before activating your WhatsApp account. Then, when WhatsApp is ready to restore your backup, log back in to your Google account.

In case any of the above solutions worked, as a workaround, you can try installing WhatsApp Business instead of the regular WhatsApp app to be able to use your account on your phone. In the meantime, uninstall the regular WhatsApp app, and try downloading it again after a few weeks to see if the issue has been fixed since.

Also, although WhatsApp support invite you to download the official app, don't hesitate to let them know that you still get the error even with the official app.

Hope that helps!

Good luck

Here are a few ideas to get you started:

Verify Version: Make sure that the latest version of WhatsApp from the official Play Store has been installed as outdated versions can cause login problems.

Clear Cache and Data: To clear away cache and data on WhatsApp, navigate your phone's Settings then Apps/Application Manager; find WhatsApp by searching, tap it to activate, select Clear cache/Clear data respectively - doing this will reset its default settings back.

Verifying Permissions: Before installing WhatsApp on your phone, ensure it has access to its storage, contacts and any required features such as apps for messaging (whatsApp), which you can check in the App Permissions section of its settings.

Disable VPN or proxy: If you use a VPN or proxy service, consider temporarily disabling it as this could interfere with WhatsApp's login process.

Temporary Network Issues: Verify you have an uninterrupted internet connection before switching Wi-Fi networks or switching mobile data service plans in an attempt to resolve temporary network problems.

I am also facing this problem 

Which phone are you using? And are you still having the issue? I am using Vivo v27. I am only getting recorded response from WhatsApp support mentioning to use official WhatsApp app.

I am also facing this problem. I am trying for many days but not working, please suggest any solution.
Advanced Thanks.

actually I just uninstall the mod WhatsApp and installed official WhatsApp from the play store and registered the number. Solved simple