Good day.
I noticed that the API explorer option for the System API generates a token that is missing the recently added email template scopes.
It works if the token gets generated from a Machine to Machine Application that has these scopes enabled, so this is only a problem when using the API explorer.
Thank you for updating the Management API with these endpoints! 
Best,
Eduardo.
Can you provide a bit more information as to what you’re trying to do? Maybe a sample query you’re trying to send?
Nevermind, I refreshed the token from the API Explorer and the scopes for email templates are included now.
So, before when copying the token generated from the API Explorer in the Management API page the scopes for email templates were highlighted red. These were read:email_templates, update:email_templates and create:email_templates.