You shouldn’t really click on links in emails as a matter of good practice. If there is a link, you should copy it, and paste it into Safari. And then return.
There could be many explanations. Location, security settings, malware settings which might be on by default.
It may be a setting within the website. (eg. I can't access my works' payroll site from home - has to be from within works internet connection - I get the same message you are experiencing)
Have you tried the option to "request desktop site" - some websites have versions for tablets etc. This forces it to load the desktop version.
Go to Settings/2 factor authentication & follow numbers beside. Its usually to update icloud/itunes/appleId. If passwords corrupt your connections are cancelled.
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Safari Cannot Open The Page Because The Server Cannot Be Found