Access Denied to Sites for Admin

Access Denied to Sites for Admin

After experimenting with your free version and speaking with your sales team, I went ahead and purchased a Standard annual plan for Zoho Mail.  One of the features that attracted me during the free trial was the app SITES.  However, once I paid, I am receiving an ACCESS DENIED message and unable to login into SITES.  As I am the only user on my account and am logged in as Administrator I am not sure how to proceed as it seems to be a rights issue.

Your help would be greatly appreciated.

Scott