https://test2.myezbooking.com/ works for me and does not return error 526 (or any other error). Try in a new session such as Incognito/Private/InPrivate browsing.
However even though the page loads, it loads broken, because you have HTTP elements loaded from within your HTTPS content (a.k.a. “Mixed-Content”). For example the URL http://test2.myezbooking.com/wp-content/themes/twentyseventeen/assets/images/header.jpg is loaded. This would have worked if your link was relative and not full (and the link would be shorter, so less data to transfer). like this: /wp-content/themes/twentyseventeen/assets/images/header.jpg)
Also broken is the design, because all the links to your CSSs are also broken:
<link rel='stylesheet' id='wp-block-library-css' href='[http://test2.myezbooking.com/wp-includes/css/dist/block-library/style.min.css?ver=5.0.3](view-source:http://test2.myezbooking.com/wp-includes/css/dist/block-library/style.min.css?ver=5.0.3)' type='text/css' media='all' />
<link rel='stylesheet' id='wp-block-library-theme-css' href='[http://test2.myezbooking.com/wp-includes/css/dist/block-library/theme.min.css?ver=5.0.3](view-source:http://test2.myezbooking.com/wp-includes/css/dist/block-library/theme.min.css?ver=5.0.3)' type='text/css' media='all' /> <link rel='stylesheet' id='twentyseventeen-fonts-css' href='[https://fonts.googleapis.com/css?family=Libre+Franklin%3A300%2C300i%2C400%2C400i%2C600%2C600i%2C800%2C800i&#038;subset=latin%2Clatin-ext](view-source:https://fonts.googleapis.com/css?family=Libre+Franklin%3A300%2C300i%2C400%2C400i%2C600%2C600i%2C800%2C800i&subset=latin%2Clatin-ext)' type='text/css' media='all' >
<link rel='stylesheet' id='twentyseventeen-style-css' href='[http://test2.myezbooking.com/wp-content/themes/twentyseventeen/style.css?ver=5.0.3](view-source:http://test2.myezbooking.com/wp-content/themes/twentyseventeen/style.css?ver=5.0.3)' type='text/css' media='all' />
<link rel='stylesheet' id='twentyseventeen-block-style-css' href='[http://test2.myezbooking.com/wp-content/themes/twentyseventeen/assets/css/blocks.css?ver=1.1](view-source:http://test2.myezbooking.com/wp-content/themes/twentyseventeen/assets/css/blocks.css?ver=1.1)' type='text/css' media='all' />
If WordPress has been the one generating all these automatically, maybe it’s a good idea to set the base URL in the configuration as https://yoursite instead of http://yoursite …