i installed and started XAMPP and can reach the website from my phone. But i know what i'm doing and of course do not know what you have done because you missed to tell us.
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I cannot find any whois information about registered domain fynn93.ml. The DNS Servers i used did not have any IP information to resolve this domain.
So did you not officially register this domain but resolved it on your computer in any other way like your Windows hosts file? In this case your phone needs a way to resolve this url by itself too.
We don't provide any support via personal channels like PM, email, Skype, TeamViewer!