To get full WhatsApp functionality, make sure you verify your business on Facebook by following these steps:

1. Go to Business Settings on your Facebook Business Manager and click Security Center.
2. Tap Verification and click Start Verification. Once you start the verification process, you can check the status in this section.
3. Enter your business details and tap Next.
4. Select the correct business from the list or “None of the above” if your name does not appear.
5. Follow the instructions on the screen to confirm your business information. If you’ve selected “None of the above” in the previous step, Facebook will ask you to verify your company by sending additional documentation.
6. Decide how you prefer to receive the confirmation code and enter the verification code.
7. And that’s it! You’ll receive a confirmation from Facebook regarding your request.

Please note that the verification decision is entirely at the discretion of Facebook. 

Remember that once your Facebook Business profile has been successfully verified, you’ll get full WhatsApp functionality and all limitations are lifted.