Make sure you have entered domain name correctly. Please note that www.domain.com and domain.com are two different domains from the technical standpoint. Thus if your website uses www prefix that domain should be added separately. To check that domain name is correctly entered go to the “Settings” > “Online Booking” and then check the Trusted Domains column. Your domain(s) must be there. To add/update a trusted domain click to the “Edit” button and then on the appeared page enter the new domain in the “Site URL” section. Also if you want your booking engine work on any domain you can use an asterix (*) instead of domain name.