Dear Zoho Support,
there is an error in browser console when we try to remove an Email Template:
(I have replaced org id with XXX).
What we do is just click on remove/trash icon for an Email Template (Books > Settings > Automation > Email templates). Then we confirm the popup about setting the default template for the contact related with the email template to remove, and then the popup dissapears but the Email Template does not change. And in browse console appears the previous 400 error log.
Regards