Problem with domain verification for new account

Problem with domain verification for new account

Dear all,

One of our new partner (medseahealth.gr) would like to be part of Zoho. I am the responsible person to do this process (to create admin account, contacts etc etc.)

So as a first step I chose the Zoho Free plan, then I created an account  n.mantamopoulos@medseahealth.gr  and now I am in the step where I have to verify the domain (please see the image below). Everything works fine until now except of the step 5. 

If you check the step 4 you will see that the link works fine and the domain path is correct (furthermore it shows the verification code). But when I click the verify button then it shows me ' We are unable to locate the HTML file in the specified path. You can try the other verification methods, or download the HTML file and try again '

What is going wrong here?

I know that a simple solution is to try with CNAME and TXT but can you please check from your own about this problem?