Hi ejiro82,
welcome to the Apple (user-to-user) Community!
Re: "Application is not loading:
The installed Apple Store application doesn’t function anymore".
Wondering which phone model you have, and which iOS version is installed on your phone ... maybe updating to the newest available iOS version could help.
If you do have the newest compatible iOS already::
Sometimes restarting your phone can help restore order when something is not working: How to: Restart your iPhone - Apple Support
or
If you have VPN installed, try turning it off, and see if that helps you connect.
Else: Apple support have an article online that gives some steps to try:
What to do: If you can't connect to the App Store, iTunes Store, or other Apple services - Apple Support
All the best :-)