Help me fix Whatsapp verification issue ( official app required)

Title: Help Me Fix WhatsApp Verification Issue (Official App Required)
Description:
I'm trying to verify my personal WhatsApp account, but I'm getting a message saying I need to use the official WhatsApp app instead of the version I currently have installed.
I need someone to:
Confirm whether I'm using an unofficial/modded version of WhatsApp and help me identify it
Guide me through safely uninstalling the current app and installing the official WhatsApp app from the Google Play Store / Apple App Store
Help me complete the verification process using my existing phone number, so I don't lose my chat history if a backup is possible
Confirm the account is fully verified and working normally afterward
What I'll provide:
Access to my phone during a screen-share session (I will not share my verification code with anyone — I'll enter it myself)
My phone number for the account
Note: This is for my own personal account recovery/verification — not for accessing anyone else's account.
Skills required: Technical Support, Mobile Troubleshooting, WhatsApp