"Unable to send template message." for Zoho CRM

"Unable to send template message." for Zoho CRM

In Zoho CRM I created a lead from my own number and made some conversation using what WhatsApp api. The last conversation was 30 hours ago and the session is expired.
To resolve the session expiration issue I created some WhatsApp message templates and all are approved.

When I open the lead and choose the Send Email > Send WhatsApp template > Mobile (the lead phone number) and then choose any of the template, it says "Unable to send template message.".

I am still on Zoho one trial. I tried to buy credit, it said "Configuration Error".

    Nederlandse Hulpbronnen