Meta says my number is not eligible for Coexistence. What now?

In short: Meta refuses numbers with too little recent activity on the WhatsApp Business app. Keep using the number normally and try again in a few days. Nothing was authorized, and the attempt cost nothing.

Why it happens

Meta checks the number inside its own connection window, before anything is authorized, and does not publish the threshold. In practice about 7 days of real use on the WhatsApp Business app has been enough, and a freshly registered or re-registered number starts from zero.

What to do

1. Keep using the number in the WhatsApp Business app, replying to a few contacts each day.
2. Make sure the app is on version 2.24.17 or newer.
3. Do not delete and re-register the number: that starts the count over.
4. Try again in a few days, from a computer.

Other refusals that look similar

• Number not found on the WhatsApp Business app: the number is on regular WhatsApp, was typed without the country code, or was moved to the API elsewhere.
• Already shared with another partner: the number is still linked to a previous provider. Log the number into regular WhatsApp, move it back to WhatsApp Business, wait 30 minutes and try again.
• A security check about a new device or location: clear it at business.facebook.com in the same browser, then connect again.

All the requirements are on What you need to connect.