HTML Verification Failing

HTML Verification Failing

Hi !
I'm trying to setup custom emails for my domain (festival4saisons.ch, which i own).  First I need to verify ownership. I'm using the HMTL option to verify. I followed each step, uploaded the verifyforzoho file in the zohoverify folder which I created in the root of my website. When I go to the address  http://festival4saisons.ch/zohoverify/verifyforzoho.html, I see the verification code which is the same as the one in the file, but when I click on the verify button, it doesn't work.

I was wondering : Does Zoho only support some domain name suffixes (like .com, .org, ...) ? Because my domain name is .ch, which is in Switzerland (Europe). Is it compatible ?

Please help me understand this ^^!
Thanks beforehand,
Lennox