The WhatsApp Business app and Lynomia Chat on one number

Most businesses in the Gulf already run WhatsApp from a phone, in the WhatsApp Business app, with one person holding the handset. Meta calls keeping that and connecting the same number to a platform coexistence. In Lynomia Chat it is the WhatsApp Business card under Settings → Inboxes → Add inbox → WhatsApp.

It exists so that you do not have to choose between the phone your staff know and an inbox your team can share.

Check whether it is available to you first

This route is built, and the whole onboarding has been tested end to end against a simulated Meta in a staging rehearsal. It has not been released to production. Two things still have to happen against the real Meta before it goes live: a signup run through Lynomia's own Meta app, and a real WhatsApp Business app number connected and messaging.

So treat this article as a description of the route, not an instruction to use it today. If the WhatsApp Business card is not on your Add inbox screen, that is expected — ask whoever runs your installation before planning a migration around it.

What it allows


You keep the number	no new number, no port, no "message us on our new WhatsApp"
The phone keeps working	the WhatsApp Business app stays on the handset and stays usable
Both sides land in one conversation	a reply sent from the phone appears in the Lynomia Chat conversation as an outgoing message, so the history is not split in two
Your team replies from Lynomia Chat	assignment, labels, canned responses, reports — the same as any other WhatsApp channel
It is an official Meta connection	the number joins the WhatsApp Business Platform; nothing is scanned, scraped or proxied

A reply typed on the phone reaches Lynomia Chat because Meta sends an echo of it. Each echo is matched by its WhatsApp message id, so a message cannot be duplicated, and Lynomia Chat never re-sends it to the customer.

What it does not do

It does not import your past chats. Nothing from before the connection comes across. Meta only allows that synchronisation in the first 24 hours after onboarding, and Lynomia Chat does not implement it at all — so it cannot be turned on later for a number that is already connected either. Your history stays on the phone.
It does not import your contacts. Contacts in Lynomia Chat are created by the messages that arrive after the connection, or by importing them yourself.
It does not change WhatsApp's rules. The number is now a WhatsApp Business Platform number, so the 24-hour window and approved templates apply exactly as on any other WhatsApp channel — including to the phone.
It is not a second channel. One number, one inbox. The phone and Lynomia Chat are two doors into the same conversation, not two conversations.

What you need first

Administrator access in Lynomia Chat.
The WhatsApp Business app, version 2.24.17 or later, signed in on the phone that holds the number.
A Meta login with admin rights on the business portfolio you want the number to live under.
The phone in your hand during setup — you confirm the connection on it.

Steps

Settings → Inboxes → Add inbox → WhatsApp → WhatsApp Business.
Read the note on the card, then start the connection. Meta's own window opens.
In Meta's window, log in and pick your existing WhatsApp Business app number.
Confirm the connection on the phone. Linked devices such as WhatsApp Web are signed out at this point; link them again afterwards if you use them.
Back in Lynomia Chat, choose the agents who will work in the new inbox.
Send yourself a test message, and send one reply from the phone. Both should appear in the same conversation — the customer's message incoming, the phone's reply outgoing.

Who can do this

Administrators only. Agents can work in the inbox once they are added to it, from either side.

Limits

There is no manual fallback for this route. If the Meta window fails, there is no credentials form to fill in instead. The ordinary WhatsApp Cloud card still has its manual setup, but that is for a number already on the WhatsApp Business Platform.
Deleting the inbox releases the number from the Meta app. Reconnecting means running the flow again, and because history is never imported, the chats from the gap do not come across.
Account Health reports coexistence, it does not control it. The inbox's Account Health tab shows a Coexistence line when Meta says the number is on the Business app as well. That is Meta's own signal.
Everything Meta decides stays Meta's. Display-name review, quality rating and the business messaging limit are reported in Account Health and set by Meta.

If it does not work

There is no WhatsApp Business card. Either your installation has no Meta app configured for it, or this route is not released on your install yet. Both are installation-level, not account settings.

The Meta window finished but no inbox appeared. The flow ended without a number that can be connected. Run it again and pick the WhatsApp Business app number explicitly.

Replies from the phone are not showing up in Lynomia Chat. Open the inbox's Account Health tab. If it reports that the webhook is not configured, or shows a URL mismatch, use Register Webhook there.

My old chats are missing. They were never imported, and there is no setting that will bring them in. Keep the phone for reference.