Use this article when a landing page custom domain stays unverified after DNS changes. bluebarry shows the exact CNAME record to add and the button to retry verification.
Check DNS Setup

- Go to Landing pages.
- Open the affected landing page.
- Click Launch.
- Open Publish to the web.
- Select Custom domain.
- Copy the NAME and VALUE from Add DNS record.
- Add the record as a CNAME in your domain provider.
- Wait for DNS to propagate.
- Click I've added the DNS record — Verify now.
If verification still fails, compare the DNS record character by character before changing the domain again.