Why Meta rejected my template, and other template errors

• "Template name must be lowercase with underscores": use only a-z, 0-9 and _.
• "Name and Body text are required": both fields are empty or missing.
• "Meta needs a sample file to review a media template": an Image, Video or Document header needs a sample. Paste a URL or upload a file.
• "Could not upload the sample image to Meta: …": the sample could not be uploaded. Try a JPG or PNG under 5 MB.
• "Failed to create template in Meta: …": the rest of the message is Meta’s own reason, for example "Sample value missing" or a body that starts with a parameter.
• Button messages: a label must be 25 characters or fewer, a website link must start with https:// and cannot contain a variable, a phone number needs the country code, and only one call button is allowed.
• "This template has a button type the CRM cannot edit yet (coupon, OTP or flow). Edit it in WhatsApp Manager.": those button types are managed in WhatsApp Manager.
• "WhatsApp configuration incomplete": no number is connected. Connect one in Settings › Channels first.

When the status is "Rejected"

Open the template with the pencil icon, change what Meta objected to, and submit it again; Meta reviews it once more. The category can still be changed on a template that is not approved.