Templates will only appear as available when you're trying to send them to a contact that has already been opted in for Whatsapp communications, as this is also a requirement for templates usage through Hubspot. You can read more about this here: Collect and manage consent for WhatsApp conversations.
If you're still experiencing this issue after verifying consent and the templates types, I would recommend connecting with HubSpot Technical Support, as Support is included in your subscription and they will be able to provide real-time assistance for this matter, where you are able to share screenshots and further information about this.
Thank you,
Kristen
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