Trying to setup a custom domain for a Zoho Creator App

Added sub-domians 

Verification was successful 

But we see Error 400 and https is not working properly.

Our Zoho account is  a premium so this feature should be available to us (we already did it with books and forms as subdomains).

I tried to email support (at) zohocreator (dot) com  but no answers (I actually never got any answer for any issue we face by emailing Zoho support addresses so I am not sure what is the right channel to get any help). 

Thanks