Why can’t I sign in to my App Store

What happens when you try? Error message(s)?

See the Apple Support article(s) below.

App Store, iTunes Store, or other Apple services - If you can't connect      

Some things you can try. Do you have access to another WiFi network where you can try? That has worked for several people.

Try a restart.

Restart your iPhone, iPad, or iPod touch         

Try a forced restart.

Reset Device.