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Reserved usernames
Before the username feature is made available, you will have the option to claim a username that WhatsApp has reserved for you. Alternatively, you can adopt a different username that aligns with your branding requirements. A reserved username can be claimed through WhatsApp Manager, Meta Business Suite, or via API. Claimed usernames that are approved will become active once the username feature is made available.
If your reserved username is already in use with your Facebook Page or Instagram account, you must link your business phone number to your Facebook Page or Instagram account before you will be able to claim the username. To link your page or account, you must have full control of the page or account, or basic partial access with the manage_phone permission.