Can’t update apps

Here are a variety of resources helping with connectivity issues:

Restart your equipment and/or sign out and back in again, and try again.

If you can't connect to the App Store, iTunes Store, or other Apple services, read this support article --> If you can't connect to the App Store, iTunes Store, or other Apple services - Apple Support

Here's a related article about what to do if you can't connect or sign in to iCloud --> If you can't connect or sign in to iCloud - Apple Support

If your iPhone or iPad won’t connect to a Wi-Fi network, or if you have related connectivity issues, read this support article --> If you can't connect to Wi-Fi on your iPhone or iPad - Apple Support

Try resetting only network settings (again, be careful what you reset here!):

Reset iPhone settings to their defaults - Apple Support

Here's a case where using a VPN prevented sign-in --> AppStore - Apple Community

Remove the VPN entirely, don't just turn off.

If none of the resources provide a solution, contact Apple for assistance:

For support, click here --> Choose your country or region - Official Apple Support Select your country, then a product. If you don't see one that handles your issue then keep experimenting with selections until you reach one that gets you a chat session or a telephone call and get the representative to redirect you.

or:

Contact Apple for support and service --> "See a list of Apple phone numbers around the world."

Click here --> Contact Apple Support - Apple Support

This person ( https://discussions.apple.com/thread/256237834 ) found that resetting their iPhone to factory settings allowed access, but that is a pretty extreme solution.

Do you have a valid payment card in iPhone, Settings, [tap your name], Payment & Shipping?

If you do not remember the Apple ID Password then follow the steps given in this Apple Article -> If you forgot your Apple ID password - Apple Support

If you do not remember the Apple ID then follow the steps given in this Apple Article -> If you forgot your Apple ID - Apple Support

If you are the owner or the owner has shared all information with you then to open Activation Lock:- If it is Activation locked, read here --> Turn off Activation Lock - Apple Support Activation Lock for iPhone, iPad, and iPod touch - Apple Support

Learn how to remove a device from a previous owner's account.

If you are not the owner and do not have the Apple ID and Password then there is no way that you can get into this iPhone unless the original owner shares the Apple ID and password with you. If you are lucky you can get into this iPhone if they (owner) accidentally remove the device from their Apple ID.

Are you using a VPN or ever had VPN app on your iPhone?