Aha, this is a "website not secure" warning? Generally, this happens because the website in question has not been authenticated against a certificate. Almost all public websites today have security certificates that the browser can test though, so this is more likely a browser issue.
If you go to a very common website, like say Google.com (which is definitely secure) and still get the error, then it is definitely an issue local to your browser.
Your phone should be trying to open these links using the phone's default browser, which in Android is "Chrome", unless you have installed a custom browser. If you have changed your browser, the new one may be having trouble authorizing certificates. If not, there may be an issue with reaching the authentication service (which can happen when the internet is partially down or facing blockages), or there may be an issue specific to your phone.
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