The two windows, and why people confuse them
There are two separate timers in WhatsApp Business, and treating them as one is the root of most CTWA budgeting mistakes.
| Customer service window | Free entry point window | |
|---|---|---|
| What opens it | Any customer message, by any route | A CTWA ad or Facebook Page CTA click, Android/iOS only |
| How long | 24 hours from the customer's message | 72 hours from your reply |
| What you can send | Any free-form message | Any message, including marketing templates |
| What it costs | Free-form replies are free | Everything is free while open |
| Opens automatically | Yes | No: only if you reply within 24 hours |
According to Meta's documentation: "If you respond within 24 hours using any type of message, the message will be free, and a Free Entry Point window will be opened, starting from the time when you responded."
A free entry point conversation requires two conditions: (1) the customer messages from a CTWA ad or Facebook Page CTA button on Android or iOS — desktop and web are not supported; (2) you respond within 24 hours. The 72 hours starts from the moment you reply, not from when the customer messaged.
What this means for how you run the campaign
- Match your ad delivery hours to when someone can actually reply
- Set an automated first response to secure the window
- Treat your reply capacity as a hard limit on ad spend
- Plan the follow-up sequence across three days, not one
Why the ad gets rejected before it ever runs
WhatsApp-side rejections are the surprising ones. The ad account is fine, the creative is fine, and the campaign still cannot launch because something is wrong with the WhatsApp Business Account behind it.
The display name problem
| Rejection ground | What Meta rejects |
|---|---|
| Identity mismatch | Name does not correspond to verified business identity |
| Promotional words | Official, Best, No.1, Cheap, Free |
| Meta product names | WhatsApp, Facebook, Messenger |
| Generic names | Customer Service, Support Team, Info Desk |
| Formatting | Emojis, excessive punctuation, slogans |
Identity mismatch is the single most common cause. The fix is completing business verification first, linking the website, and making sure the Facebook Page name and the requested display name tell the same story.
What Click-to-WhatsApp Ads cannot do
It cannot push, only pull. CTWA starts conversations when someone chooses to click. You cannot use it to reach people who have not engaged.
A click is not a conversation. The ad opens WhatsApp with a pre-filled message the user can edit or delete. Plenty of people open it and never press send. You pay for the click either way, and no window opens.
Desktop and web do not count. The free entry point requires Android or iOS.
Attribution is harder than a landing page. Without a platform connecting ad click to conversation to outcome, you lose the thread between spend and revenue.
The short version
Click-to-WhatsApp Ads work well when three things are true: you have a genuine reason for someone to start a conversation, you can reply inside 24 hours, and you treat the following 72 hours as the actual campaign.
Most of the value people describe as "the 72-hour free window" is really the reward for answering quickly.
